The invention discloses a shoe sole grinding machine, which comprises a base, a motor, a rotary cylinder, a rotary cylinder shaft, an inner spline shaft, an outer spline shaft, a box body, a grinding rod and a grinding rod shaft; the base is located at the bottom of the equipment, and the The other components mentioned above are all located on the base, and the upper tail of the base is provided with a motor, which is connected to the shaft of the rotary drum. The shaft of the rotary drum is covered with a rotary drum. One end of the connecting rod is inserted into the rotary groove, and the other end is connected to the box body. The inner spline shaft is located under the rotary drum shaft. The inner spline shaft is equipped with a small gear, and the outer spline shaft is equipped with a large gear. Bevel gears are installed at the end, and grinding rod shafts are also installed through both sides of the casing, and a grinding rod is fixed outside one end of the two grinding rod shafts. The shoe sole grinding machine of the present invention has simple and compact structure, high transmission efficiency, and can automatically grind two pairs of shoe soles at the same time.