The quality of gear reducer overhaul plays a decisive role in the stability of coal mine equipment overhaul. This paper introduces the design of a loading test system for gear reducer in coal mine. Through the establishment of the test bench, the loading test, temperature rise test and efficiency test of gear reducer overhaul can be realized, so as to improve the quality of gear reducer and avoid the abnormal operation of equipment due to gear reducer installation failure. This reducer loading test-bed can be widely used in the overhaul industry of continuous excavation equipment. The reducer is an indispensable part of the mechanical transmission device, it is widely used in many fields in our country, with the rapid improvement of China’s industrial development and the popularization of mechanization, the use of the reducer is also more and more broad, but in some large industrial and mining enterprises, the working environment of the reducer is relatively harsh, so the design of the reducer loading test bed has no advantages Measurable significance, in the last process of the reducer production of its a series of performance testing, such as temperature rise test, noise test, durability test, overload test, no-load test, this loading test bench designed a small power reducer test bench for a loading scheme, the scheme variable load method is simple and reliable.