In view of the yangquan coal mine a powerful belt conveyor non-return device non-return rated torque, small, poor ability to resist reverse problem,the role of non-return device in belt conveyor are introduced and the important meaning, belt conveyor for the increase of non-return device technical renovation, in accordance with the requirements of belt conveyor parameters and selection of non-return device design.Practice shows that the improved device performance is good, to ensure the safe operation of the belt conveyor, solve the problem of the hidden trouble of the belt transport,provides the necessary conditions for high efficiency coal mine and coal mine safety production.