A planter tool magazine for realizing automatic tool change of the present invention comprises a tool magazine room, the side of the knife magazine room is provided with a knife magazine door which can be opened and closed, and a knife holder base is arranged inside the knife magazine room, and There is a rotating mechanism, on which there is a disc tool holder, on which there are several layers of tool holders uniformly distributed along its circumference, and a tool magazine bracket is provided in the tool magazine room, and a lifting mechanism is provided on the tool magazine bracket And the pressing mechanism, the pressing mechanism is arranged above the disc knife holder, the lifting adjustment of the pressing mechanism is realized through the lifting mechanism, and then the pressing mechanism is used to realize the pressing cooperation with the tool change key on the mechanical arm of the planter, the disc knife holder and the knife magazine door There is a tool setter for aligning the knives on the robot arm of the planter in between. The present invention can cooperate with realizing the requirement of automatic tool change of the mechanical arm of the implanter, greatly improves the degree of automation of the tool magazine system of the implanter, improves the processing efficiency of the implant, and reduces the production cost. The invention also proposes an automatic tool changing method.