The working arm can rotate 360° along the vehicle axis, swing left and right ±35° (swing amplitude ≤5000mm), and move up and down 350mm, which can meet the requirements of excavation, side digging, flipping, rock breaking, loading, lifting and other action requirements, and realize multiple functions such as excavating drainage ditches, lying bottom, rock breaking, cleaning floating coal, cleaning the bottom of belt conveyors, leveling roadways, and lifting small components.