The invention provides a double-shaft eight-wheel floated loading vehicle for a roadway acceleration loading test, which belongs to the field of test equipment. The double-shaft eight-wheel floated loading vehicle for a roadway acceleration loading test is characterized in that a front rotating shaft and a rear rotating shaft are arranged on the loading vehicle; both two loading steel wheels and two return steel wheels are assembled on each rotating shaft, and the return steel wheels can freely rotate around the rotating shafts. In the repeated rolling test process of the loading vehicle of the roadway acceleration loading test device on the roadway, the loading vehicle reliably realizes the processes of loading roll and unloading return, thereby more favorably solving the problems of special loading orbit curve and unequal distance of a return orbit in the running of the four-shaft eight-wheel floating mechanism loading vehicle, simplifying the structure and the process of the loadingvehicle and improving the safety and the reliability of the whole roadway acceleration loading test device.