The electric single-girder suspended crane is composed of a main girder welded with U-shaped grooves and I-beams, end girders, an electric hoist and an electric trolley. It is suspended on the I-beam track at the upper part of the factory building, with a cantilever length of 0.5 to 1 meter. The electric hoist runs along the lower flange of the main girder I-beam to complete the lifting of items. It features a lightweight structure and convenient installation and maintenance. It is widely applied in production workshops, warehouses, freight yards and other places. The job level is A1 to A4.