Positioning device of output shaft on motor

The utility model discloses a positioning device for an output shaft on a motor. The positioning device comprises a positioning placing seat, a positioning pressing assembly located above the positioning placing seat and a positioning rotating assembly located below the positioning placing seat. The positioning placing seat is used for placing the motor, and is provided with a through positioning through hole for exposing the output shaft; the pressing assembly tightly presses the motor on the positioning placement seat; the positioning rotating assembly comprises a rotating driver, a rotating connecting piece, a positioning elastic piece and a positioning head, and the positioning head and the rotating connecting piece are in sliding connection in the vertical direction; the rotary driver is connected with the rotary connecting piece and drives the rotary connecting piece to rotate; a flat position groove matched with a flat position on the output shaft is formed in the top surface of the positioning head; t