The invention provides an auxiliary adjusting lock. The auxiliary adjusting lock comprises a clamping groove, an adjusting nut I, a round pipe, an adjusting nut II and a screw rod; the clamping groove is a U-shaped clamping groove consisting of a clamping groove steel plate I, a clamping groove steel plate II and a clamping groove baseplate; one end of the screw rod is connected with the clamping groove steel plate II; the screw rod is perpendicular to the clamping groove steel plate II; the adjusting nut I and the adjusting nut II are twisted on the screw rod; the round pipe is inserted in the screw rod; and the round pipe is positioned between the adjusting nut I and the adjusting nut II. Multiple sets of auxiliary adjusting locks are coacted; and the adjusting nuts rotate to apply thrust or tension to a wall body to guarantee the perpendicularity of the wall body in a designed range.