Stirring speed reducer

The stirring speed reducer comprises a motor, a shell, a transmission shaft, a worm gear and a worm, the motor is connected with the shell through a fastener, the motor is in transmission connection with the transmission shaft arranged in the shell through a motor shaft, the worm gear is arranged on the transmission shaft, the worm gear is in transmission connection with the worm, and the worm gear is in transmission connection with the worm. The outer end of the worm is in transmission connection with a coupler used for being connected with a stirring rod, the coupler is arranged at the outer end of the worm in an axial displacement mode, and an elastic disc used for applying axial elastic force to the coupler when the coupler moves towards the direction close to the worm is further arranged between the worm and the coupler. The elastic disc capable of preventing locking is arranged on the worm, so that gear matching between the worm gear and the worm is precise and stable, the locking phenomenon is not pron