Integrated motor reduction gear box of full-automatic intelligent door lock

The invention relates to an integrated motor reduction gear box, in particular to an integrated motor reduction gear box of a full-automatic intelligent door lock. The reduction gear box is composed of a shell, a motor and a worm, the motor is installed on the shell, multiple stages of reduction gear sets which are meshed with one another are installed in the shell, a center shaft is installed in the center of the shell through an assembly hole, and a limiting mechanism and a reset mechanism are arranged between the center shaft and the shell. According to the reduction gear box, the handle can be directly rotated to achieve rapid unlocking and locking, and the motor can also be used for driving the center shaft to rotate so as to achieve rapid unlocking and locking; therefore, the design can be simplified, the thickness of the lock panel is effectively reduced, the production cost is reduced, the shell can form a planar whole, and the attractiveness is effectively improved; the problems that an existing door