Cantilever crane is a small and medium-sized lifting equipment developed in recent years. It has the characteristics of unique structure, safety and reliability, high efficiency and energy saving, time and labor saving, and flexibility. It can operate freely in three-dimensional space, and shows its superiority over other conventional lifting equipment in intermittent and dense transportation occasions. This product is widely used in different places in various industries. The working intensity of cantilever crane is light. The crane consists of an upright post, a rotary driving device of a rotary arm and an electric hoist. The lower end of the column is fixed on the concrete foundation through the anchor bolt, and the rotary arm is driven to rotate by the cycloidal pin wheel reducer. The electric hoist runs right and left in a straight line on the I-beam of the slewing arm to lift the heavy objects. The crane boom is a hollow steel structure with light weight, large span, large lifting capacity, economy and durability. The built-in walking mechanism of swing arm crane adopts special engineering plastic wheels and rolling bearings, which has low friction and is light to walk; The structure size is small, which is especially beneficial to improve the hook stroke.