The invention relates to an automobile sliding table test device connected with a sliding table. The automobile sliding table test device comprises a first supporting rack, a second supporting rack, a first adjusting beam, a second adjusting beam and a bearing board, wherein the sliding table is provided with a mounting surface, two mutually perpendicular directions in the mounting surface are defined to be a first direction and a second direction, a direction perpendicular to the first direction and the second direction is defined to be a third direction, the first supporting rack and the second supporting rack are oppositely arranged on and connected with the mounting surface of the sliding table along the second direction, the first supporting rack is provided with multiple first vertical beams, a first adjusting beam is adjustably connected with the first vertical beams along the third direction, the second supporting rack is provided with multiple second vertical beams, a second adjusting beam is adjustably connected with the second vertical beams along the third direction, and the bearing board is connected between the first adjusting beam and the second adjusting beam along the first direction. According to the automobile sliding table test device, adjustment can be rapidly and conveniently carried out according to different seat heights and positions of models of test-needing automobiles, and test efficiency is effectively improved.