Assembly type mechanical arm

The utility model discloses an assembly type mechanical arm, and relates to the technical field of mechanical arms. The assembly type mechanical arm comprises a mechanical arm body and a mechanical arm movably installed on the surface of the mechanical arm body, a wire passing groove is formed in the surface of the mechanical arm, and a cover plate is attached to the interior of the wire passing groove. According to the mechanical arm, through the arrangement of the wire passing groove, wire passing can be conducted on internal circuits of the mechanical arm, when the mechanical arm breaks down, after the cover plate is opened, the internal circuits can be directly seen, the internal circuits of the mechanical arm can be conveniently overhauled and maintained, the overhauling and maintaining time is saved, and the overhauling and maintaining efficiency is improved; by installing the positioning device and the adjusting device, the cover plate can be rapidly installed in the wire passing groove, by installing