The seedling-pushing device based on the conjugate cam was proposed aiming at the problems, that ending time of seedling-pushing was advanced or delayed, of the traditional walking-type rice transplanter’s seedling-pushing device. According to kinematics curves of the seedling-pushing rod which were got from the walkingtype rice transplanter’s driving mechanism with planetary elliptic-gear trains and requirements of planting agriculture, the reverse model of the seedling-pushing device was established. A reverse design and simulation software of this seedlingpushing device was compiled based on Visual Basic 6.0. A set of optimum parameters which met the requirements of planting agriculture were received by the software. The structural design was carried on by using these parameters. Virtual prototype test was performed after finishing the 3-D design of the transplanting mechanism, whose results showed that the seedling-pushing device could meet the working requirements of walking-type rice transplanter and the ending time of seedling-pushing was accurate. 