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 ; The double-cavity large-span outrigger structure provides better operating stability; the rack cylinder is used to drive the rotation, which is smooth and powerful, easy for maintenance, and the rotation angle can reach 420°; it is equipped with an operation warning light to remind surrounding people and vehicles that they can Reduce accidents and improve operating safety; equal torque design, stronger lifting performance; standard L-HM (CY) XCMG special wide-temperature hydraulic oil, which can be used in winter and summer.