The cantilever crane is composed of a column, a slewing arm, a slewing drive device and an electric hoist. The lower end of the column is fixed on the concrete foundation through anchor bolts, and the cantilever is driven by a cycloidal pinwheel deceleration device. Run in a straight line from side to side and lift heavy objects. The jib of the crane is a hollow steel structure with light weight, large span, large lifting capacity, economical and durable. The built-in traveling mechanism adopts special engineering plastic traveling wheels with rolling bearings, which has small friction and brisk walking; the small structure size is especially conducive to improving the hook stroke.