Abstract: According to the problems that traditional manual or mechanical ropeway tension adjustment approaches were subjected to intensity limits and failed to detect real-time dynamic variations for driving-chain tensions, which causing corresponding hysteretic nature and poor self-adaption, a related device was designed to automatically adjust driving-chain tension by corresponding variation detection and PID control under different payloads for improving transportation security and reliability of fruits and agricultural products in mountain orchard. As a result, the detected mean values of driving-chain tension were ranging from 653.5944 N to 763.4059 N when ropeway system was running under no control, and ranging from 508.1988 N to 568.7609 N under PID control. In conclusion, this system could effectively achieve automatic driving-chain adjustment with maximum tracking error of 104 N and mean error of 13.6417 N.