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Aiming at the existing problems of big hole and bad verticality of picking hole mechanism, a kind of picking hole mechanism of noncircular gear planetary system for deep liquid fertilizer was designed. To make picking hole mechanism satisfy the agronomic required verticality when it gets into and out of the soil, the reverse design and kinematics simulation analysis of picking hole mechanism of noncircular gear planetary system were presented based on Matlab GUI development platform. Through the finetuning of a small amount of date points on static trajectories which were generated in the inverse design and kinematics simulation, a set of optimal parameters were obtained. The picking hole mechanism model was established by applying Pro/E software. And with the ADAMS software, the trajectory curves were got. Finally, this picking hole mechanism was tested on the testbed, and the results showed that when the hole width was 30.3mm and the hole distance was 221.9mm, the proposed picking hole mechanism could meet the design requirement, that means, good verticality and small hole when it gets into and out of the soil.