The invention discloses a crane with a lifting trolley, a suspending trolley and a balance weight. The crane comprises a double-beam bridge frame formed by main beams and end beams. Large vehicle driving devices with wheel teeth arranged on wheel rims and safety hooks are arranged at the two ends of the end beams. The lifting trolley and the suspending trolley are connected between two rails. A lifting hook type jack-up lifting device is arranged on the lifting trolley. A rotating mechanism is arranged on the suspending trolley. The lower end of a suspender shaft in the rotating mechanism is connected with a hanging base in a cantilever component, and the upper end of the suspender shaft is connected with a collecting slip ring. The hanging base in the cantilever component is welded to oneend of the cantilever beam. The balance weight is hung at the end, close to the hanging base, of the cantilever beam, the other end of the cantilever beam is connected with an electric hoist and a vehicle bumper device, the electric hoist can horizontally move along the cantilever beam, and the cantilever beam is located below the main beams, can stretch out of a workshop to work, and can rotateon the horizontal plane at any angle.