Knuckle boom truck-mounted crane, the whole machine adopts finite element lightweight design, with light weight and small installation space; compact and beautiful structure; the new hexagonal arm section has greater lifting capacity at the same amplitude and strong cross-section resistance to bending and torsion ;Adopt regeneration control and new sequential telescopic control system to reduce the pressure loss of boom telescopic, improve load telescopic capacity and overall machine working efficiency; adopt rotatable two-stage double-cylinder outriggers to improve site adaptability, and have more The large span improves the working stability of the whole machine; the loading and unloading control, the turntable high seat control, and various control forms meet the needs of different customers; the hydraulic proportional valve on the car has good micro-movement performance and can perform compound actions and control High comfort; standard high-power radiator ensures that the oil temperature of the crane is not too high during long-term heavy-load operation; standard L-HM (CY) XCMG special wide-temperature hydraulic oil can be used in winter and summer.