Auxiliary device for quick assembly of fabricated building

The utility model discloses an auxiliary device for quick assembly of a fabricated building, which comprises an auxiliary supporting device, the auxiliary supporting device comprises a counterweight base and a lifting type movable base arranged at the bottom of the counterweight base, the middle part of the counterweight base is provided with a mounting groove, and the two sides of the counterweight base are symmetrically provided with a plurality of groups of notches; a supporting cross beam is movably arranged in the mounting groove, the supporting cross beam is composed of two sets of side plates, a connecting shaft, a positioning bolt, a cross beam body and a contact plate, the side plates are symmetrically installed at the notch position, the connecting shaft is inserted into the lower end of the cross beam body in a penetrating mode, and the two ends of the connecting shaft are rotationally connected with the side plates; the contact plate is located at the outer end of the cross beam body, the two side