The invention relates to a motor shaft positioning device for an automatic snap spring inserting system. The problems that in the snap spring inserting assembly process in the prior art, a manual manner is adopted for positioning and transferring a motor shaft, the labor intensity is large, the work efficiency is low, and the assembly precision is low are solved. The device comprises a motor shaft positioning part and a motor shaft supplying part; the motor shaft positioning part comprises a lifting mechanism which is provided with a motor shaft clamping and taking mechanism; the motor shaft clamping and taking mechanism comprises an installing bottom plate to which two positioning strips are hinged; a guiding inclined block driving the two positioning strips to be opened and closed is arranged on the two positioning strips; the installing bottom plate is provided with a clamping and taking cylinder; and the movable end of the cylinder is connected with the guiding inclined block. The motor shaft positioning device for the automatic snap spring inserting system has the beneficial effect of solving the problems, that the labor intensity is large, precision is low and the work efficiency is low, caused when the motor shaft is traditionally transferred in a manual manner for performing snap spring inserting operation. The manpower resource is reduced, the work efficiency is improved, the snap spring assembly precision is improved, and the device is applicable to industrialized large production.