Abstract: Abstract: The European Community is an international leader in dry field transplanting machines. The core working part of its vegetable transplanting machine is composed of 3 or 4 set of device generally, completes three movements of taking seedlings, transporting and planting, but it has the deficiency of complex structure, high cost and low efficiency. In order to simplify the structure, Japan's vegetables pot seedling transplanting machine adopts two sets of institutions. It combines the seedling fetching device with conveying device as one, using a combination of rotary and slide mechanism to complete the complex movements of taking and deliverying seedlings. However, due to the addition of the slide mechanism, it greatly reduces the productivity, and the slide is easily worn after long hours of working. The working reliability can not be guaranteed. Transplanting machines in domestic application, most of them are semi automatic transplanting machines with low efficiency and high labor intensity. According to the above problems, an inverted vegetable pot seedling transplanting mechanism is proposed in this paper by using modified elliptical gear, cylindrical gear and conjugate cam as the transmission mechanism. The transplanting mechanism can meet the requirement for completing multiple actions by using a set of mechanisms, which simplifies the structure and improves the transplanting efficiency. The vegetable transplanting machine with this mechanism can reach the level of full automation and high efficiency. First of all, on the basis of analyzing the working principle of the transplanting mechanism, the kinematics model of the mechanism was established. Then an analysis and optimization software for the mechanism was developed with Visual Basic 6.0. Finally, a set of structural parameters were obtained by a human-interactive optimization method to meet the requirements of the vegetable pot seedling transplanting. 2D drawing and 3D model were established and imported to ADAMS (Automatic Dynamic Analysis of Mechanical Systems) for simulation. The simulation results were compared with that obtained by the optimization software, which validated the theoretical analysis. The study can provide a reference for designing the vegetable pot seedling transplanting mechanism.