The working intensity of the cantilever crane is light. The crane is composed of a column, a rotating arm driving device, and an electric hoist. The lower end of the column is fixed to the concrete foundation through anchor bolts, and the cantilever is driven to rotate by a cycloidal pin wheel reduction device. The electric hoist runs in a straight line on the cantilever I-beam and lifts heavy objects. The crane rotating arm is a hollow steel structure with light self weight, large span, large lifting capacity, and economic durability. Built in walking mechanism, using special engineering plastic walking wheels with rolling bearings, with low friction and light and fast walking; The small structural size is particularly beneficial for improving the hook travel.