The invention relates to a support riveting device for an upper sliding plate of an automobile lifter. The support riveting device comprises a motor positioning mechanism used for positioning a motor of the automobile lifter. A spring core pressing mechanism used for pressing one end of a spring core of the automobile lifter into a wire wheel frame of the motor of the automobile lifter is arranged on each of the two sides of the motor positioning mechanism. One side of the motor positioning mechanism is further provided with a wire support riveting mechanism used for riveting a wire support of the automobile lifter into a guide rail support of the automobile lifter. By means of the technical scheme, the upper sliding plate support riveting device has the technical beneficial effects that the production efficiency is effectively improved, and the yield is effectively increased.