The invention discloses an automobile button bottom plate and sleeve clamping device with an auxiliary deformation mechanism. The automobile button bottom plate and sleeve clamping device comprises arack. A pressing frame is fixed to the top face of a top plate of the rack. A fixed plate is fixed to the middle of the top face of the top plate of the rack. A toothed protruding portion is formed inthe middle of the top face of the fixed plate. Air suction through holes are formed in the positions, around the toothed protruding portion, of the fixed plate. A lower groove is formed at the position, under the fixed plate, of the bottom face of the top plate of the rack. Two pressing air cylinders are fixed to the top face of a top plate of the pressing frame. Push rods of the two pressing aircylinders penetrate through the bottom face of the top plate of the pressing frame and are fixed to the top face of the same pressing disc. According to the automobile button bottom plate and sleeveclamping device, a sleeve and a button bottom plate can be automatically clamped and fixed, the inclination degree of the clamping portion can be adjusted before clamping and fixing, and therefore theclamping portion is prevented from colliding with the lower portion of the sleeve, friction during clamping can be reduced, the strength of the clamping portion can be guaranteed, and fixing is firm;and the locating effect of the button bottom plate and the sleeve is good, the outer surface is not prone to being damaged, and the appearance quality is guaranteed.