The invention relates to a device for fixing a wind tunnel wedge, which belongs to a wind tunnel simulation device and method. The device includes a detachable base, a metal cap, a screw, a nut, a rubber pad and a wedge vertical shaft; the detachable base is a metal plate with a T-shaped groove, which is set at the bottom of the wedge vertical shaft, and the T-shaped groove A layer of rubber cushion is adhered to the bottom of the inner and metal plate; a layer of rubber cushion is adhered to the top of the metal cap; one end of the vertical shaft of the wedge is fixed in the T-shaped groove, and the other end is connected to a screw rod, which is covered by the metal cap Inside; by rotating the nut on the screw rod, the metal cap fastened on the upper part of the screw rod is pushed to move upward, so that it is pressed against the top of the wind tunnel to fix the wedge. The groove of the base of the invention constrains the local deformation and instability of the wedge, the base increases the contact area between the bottom of the wedge and the bottom surface of the wind tunnel, and increases the stability of the wedge; the multi-layer rubber cushion makes the wedge and the top and bottom plates of the wind tunnel The contact is more uniform, which increases the anti-skid ability between the two, and makes the fixing of the wedge more reliable.