The invention provides a novel wire hanging mechanical arm. The novel wire hanging mechanical arm comprises a fixed base, a first telescopic arm, a second telescopic arm, a third supporting arm and a wire hanging tray. The fixed base, the first telescopic arm, the second telescopic arm and the third supporting arm are connected in sequence in a hinged manner, and each hinged connection portion is provided with a limiting mechanism. The wire hanging tray is fixed to the head end of the third supporting arm and comprises a storage disk, a voltage test wire hanging area, a current test wire hanging area and a photoelectric head wire hanging area. The outer side of the photoelectric head wire hanging area is provided with a row of hanging rings. Through the wire hanging tray arranged at the front end of the mechanical arm, orderly distribution of on-site wires of on-site collation can be achieved; and meanwhile, through adjustment of the supporting angles and the supporting positions of the first telescopic arm, the second telescopic arm and the third supporting arm, the stress of the wires is greatly lowered, and a guarantee is provided for stable connection of the wires.