Steel structure box girder hoisting device

The invention discloses a steel structure box girder hoisting device, and belongs to the technical field of steel structure box girder construction, the steel structure box girder hoisting device comprises first slings, side extension rods, second slings, guide frames and guide wheels, the top ends of the first slings are connected with hoisting machinery, and the side extension rods are vertically mounted at the bottoms of the outer sides of the two first slings on the same side; the second sling is used for bypassing the hoisted steel structure box girder from the bottom, the guide frame is installed on the top of the installed steel structure box girder, and the guide wheels are rotationally installed on the two sides of the outer side ends of the side stretching rods. And the guide wheel moves downwards on the slope surface of the guide frame, so that the to-be-mounted steel structure box girder is close to one side of the mounted steel structure box girder until the opposite side surfaces of the two stee