Light modular robot driving joint

The invention discloses a light modular robot driving joint. The light modular robot driving joint comprises a cylindrical shell, wherein a motor is arranged in the shell and comprises a stator and a rotor; the rotor and an output shaft of the motor are fixed through axial positioning; one end of the output shaft of the motor and a flexible gear of a harmonic reducer through an adapter flange; the other end of the output shaft of the motor is connected with a brake; a synchronous belt pulley I is further mounted at an end, which is connected with the brake, of the output shaft of the motor and is connected with a synchronous belt pulley II mounted in the shell through a synchronous belt; an absolute type encoder is arranged on the synchronous belt pulley II; a control system is mounted in the shell and comprises a driver; and the driver is fixedly mounted on a support in the shell, and is connected with various executive components in the shell through electrical circuits. The light modular robot driving join