1.A frame with a medium wheelbase is adopted to provide high stability, mobility and flexibility and high adaptation to various types of working conditions; 2.Working mechanism with a single rocker, optimized design of articulated point, high lifting force and breakout force, short working cycle; 3.The front frame has a four-plate structure and the rear frame has a box girder structure with a high structural strength; 4.The bucket is capable of high-level automatic leveling to reduce the labor intensity and increase the working efficiency of the operator; 5.Key articulated points of the working mechanism have a dustproof structure to prolong the working life of the pin shaft