The electric single-girder suspension crane is composed of a main beam welded by steel plate and I-beam, an end beam, an electric hoist and an electric sports car. It is suspended on the I-beam track at the upper part of the factory building. The lower flange of the I-beam runs to complete the lifting work of the goods. It has the characteristics of light structure, convenient installation and maintenance, and is widely used in production workshops, warehouses and freight yards. The working level is A3-A5.