Drawing beam for manipulator and manipulator

The drawing beam comprises a beam body which is integrally formed in an extrusion mode, an installation groove is formed in one face of the beam body, and the interior of the beam body is hollow. A supporting body used for abutting against the bottom of the installation groove and the other face of the beam body is arranged in the beam body, the supporting body is arranged in an hourglass shape, and a connecting hole which vertically penetrates through the supporting body and is communicated with the installation groove is formed in the beam body. A left cavity and a right cavity are formed in the beam body through supporting bodies, arc-shaped protruding strip parts are arranged on the cavity corners of the left cavity and the right cavity, a solid part is arranged on the beam body and located in the vertical direction of the arc-shaped protruding strip parts, and assembling screw holes are formed in the arc-shaped protruding strip parts and the solid part. The drawing beam for the mechanical arm is connecte