The utility model discloses a from lift -type platform loading test device, including output gear case and load gear box, output gear case and load gear box branch occupy the front and back both sidesof the supporting box body, the output gear case with the respective output shaft of load gear box all passes the mounting hole that corresponds on the supporting box body, and each all be provided with the gear on the output shaft, two through idler meshing transmission between the gear, two gear and idler all are arranged in the recess that supporting box body upper surface formed along left right direction. The utility model discloses the design is novel, reasonable in design and convenient to use, through setting up the structure that the supporting box body and idler come rack and pinionamong the substitution prior art for it is more stable in the real -world operation, operate simplyr, save the manpower and material resources resource.