The present utility model relates to a mining winch decelerator especially adapting to mining prop drawing dispatching winch, the decelerator includes a box, bevel gear transmission, duplex gear transmission, column gear transmission disposed in the box, and a speed control device composed of handle, speed control pole, shifting block, shifting fork pole and shifting fork. The duplex gears of the duplex gear transmission are connected with a brake rack for bearing support force and rotating with the duplex gears, the end of the brake rack protrudes to the outside from the decelerator box and supports on the decelerator box. The shaft head of the decelerator can connected with an electrohydraulic braker to enhance the brake force or realize the purpose of effective brake, the quick, slow speed and big gear ratio are realized, one machine has multiple uses, the structure is compact, it is adapt to narrow operating space under mines, with large pull. It is simple in fabrication technics with low cost, convenient in operation, safe and reliable, the maintenance cost is low and has broad practicability.