The new hexagonal arm section has the advantages of greater lifting capacity at the same amplitude and strong bending and torsion resistance of the section. The hook adopts a horizontal automatic retracting hook with independent intellectual property rights. The large-span square box outriggers are used to improve operational stability and improve the mid-to-long-range lifting capacity. An over-winding protection device is adopted to prevent safety hazards caused by wire rope breakage. It adopts an integral rotary mechanism, which is light in weight, good in craftsmanship and high in production efficiency.