Cantilever crane device capable of adjusting cantilever angle

The utility model relates to the technical field of cantilever cranes, in particular to a cantilever crane device capable of adjusting the angle of a cantilever, which comprises a stand column, a rotating column rotatably connected to the top end of the stand column, cantilevers fixedly arranged on the surface of the rotating column along the horizontal direction, electric hoists movably arranged on the cantilevers, a rotating ring and a driving mechanism, the stand column is rotationally sleeved with the rotating ring, an inclined strut is fixedly arranged on the upper surface of the rotating ring, and the top end of the inclined strut is fixedly connected with the cantilever. The driving mechanism is arranged on the stand column and used for driving the rotating ring to rotate. The cantilever can be synchronously driven to rotate through rotation of the rotating ring, and meanwhile, the angle of the rotating ring can be locked through the positioning mechanism, namely, the angle of the cantilever is locked,