Abstract: Precise seeding on point is a wheat seeding method which can control the spatial distribution of seeds in the soil effectively and strive to achieve equal seeding amount, grain spacing and seeding depth, so as to further improve the seeding quality of wheat. In order to achieve this goal, the organic combination of precision seeding and accurate seed casting was put forward. The functions of quantitative seed separation and stable seed transportation of seeder were integrated into the seed casting device to change the form of seed transportation, so as to realize the precision fixed seeding of single grain of wheat. This paper put forward a method based on seed adsorption, point perforation and precision seeding. According to this method, the pinhole-tube wheat precision seeding device was designed. The main working principle is as follows: The outer wall of the seeding wheel is pressed on the soil, and the pinhole seed suction tube is inserted into the soil. When the seeding wheel rolls, the pinhole seed suction tube is driven to rotate. The pneumatic distribution mechanism is connected with the fan that is divided into negative pressure area and positive pressure area to provide pressure for the pinhole seed suction tube in the position of seeding and throwing. The pinhole seed suction tube with negative pressure picks up the seeds in the seed box, and transports the seeds to the soil with the rotation of the seeding wheel. When the pinhole seed suction tube reaches the designated seed drop point, it is in the positive pressure area of the pneumatic distribution mechanism. The seed suction hole changes from negative pressure to positive pressure, and seeds are blown into the soil to complete the sowing. According to the number of basic seedlings required by precision seeding method, the planting frequency was calculated to determine the plant spacing. The appropriate directional planting distance was 2.73 cm and the spacing angle in seeding wheel of pinhole seed suction tube was 15.65°. When the pinhole seed suction tube was inserted into the soil, the rotation of seeding wheel and other factors would produce displacement in the soil. The stirring distance in the soil was 7.86 cm by calculating, which was greater than the plant spacing. 3 rows should be arranged because of the less the row number of pinhole seed suction tube, the greater the absolute distance between 2 plants. The seed suction hole diameter had a great influence on seed suction effect by studying the principle of pinhole seed suction tube to absorb seed. The mechanical model of seed suction was established when seed suction holes were arranged in different positions of pinhole seed suction tube. The factors arranged from largest to smallest by the seed suction force requirement was reverse side of contact soil surface, top surface and contact soil surface. It was concluded that it would have a great influence on seed suction by analyzing the seed suction surface shape of pinhole seed suction tube. Therefore, the above 3 factors were taken as influencing factors, and the orthogonal test was conducted with the parameters of leakage seed index, multiple seed index and single seed index. The optimum combination was obtained as follows: the seed suction hole position was in the top surface, the seed suction hole diameter was 2 mm, and the seed suction surface shape was convex. Under the condition of optimal parameter combination, the experimental results showed that the leakage seed index was 4.1%, the multiple seed index was 7.3%, and the single seed index was 88.6%, which met the design requirements. By analyzing the experimental data, it was concluded that the 3 factors had significant influence on the experimental results. The reliability of the theoretical analysis results was verified by comparing with the experimental results. The rationality analysis of the differences between the results and analysis is carried out to lay a foundation for further research. It provides a reference for the design and performance improvement of precision seeding machinery and promotes the development of precise seeding on point of wheat.