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 luffing mechanism adopts connecting rod design, compact appearance and improved lifting moment; double-cavity large-span support The leg 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°; the equal moment design has stronger lifting performance; the anti-angle design is carried out to improve the working environment Stronger adaptability; the standard L-HM (CY) XCMG special wide-temperature hydraulic oil can be used in winter and summer.