Assembling device for through shaft

The invention discloses an assembling device for a through shaft of a crane. The assembling device comprises a supporting plate (1), a connecting rod (1) transversely penetrating through the supporting plate (1), at least two large bolts (4) transversely penetrating through the supporting plate (1) and matched with the supporting plate, and a wrenching part for driving the large bolts (4) to rotate and screw; a fastening part is arranged at one end of the connecting rod (2) for fixedly connecting to-be-assembled through shafts with the connecting rod (2); and the assembling device for the through shaft further comprises a detachable locating device for fixing the relative positions of the connecting rod (2) and the supporting plate (1). According to the assembling device for the through shaft disclosed by the invention, the through shaft is moved by the acting force between the large bolts (4) and a rotary table, no too much manpower investment is required in the assembling process of the through shaft, so that the assembling efficiency and the assembling precision of the assembling device are improved.