Abstract: A thin motor joint module is provided, which includes a power component, a gear reducer component, and an output component, the power component, the gear reducer component, and the output component are all provided in a housing. The power component is provided with an axial magnetic flux motor, the gear reducer component is provided with a harmonic reducer, and the housing is composed of lightweight metal materials and PEEK materials. The advantage of the present disclosure is that the axial magnetic flux motor is provided in the power component. Compared with traditional radial magnetic flux motors, the axial magnetic flux motor is flatter and outputs a larger torque, which can reduce an axial length of the joint module and ensure a larger output torque. The housing is made of lightweight metal materials and PEEK materials, thus forming a high torque, high energy density, and lightweight joint module.