Abstract: In view of problems of small detection range, difficult installation position setting and easy misoperation existed in traditional protection devices for prevention of coal piling wearing tail rope, a protection system for prevention of coal piling wearing tail rope in mine was designed based on two-dimensional laser radar scanning technology and active infrared radiation sensor technology. The system adopts two layer protection system structure. When coal piling reaches the first layer protection system named two-dimensional laser radar scanning system, ranging information output by the two-dimensional laser radar scanning system changes and is uploaded to upper computer. The upper computer controls alarm device and starts the second layer protection system named active infrared radiation sensor system. When coal piling level increases continuously to reach the active infrared radiation sensor system, level signal output by the active infrared radiation sensor system changes and is uploaded to the upper computer. The upper computer controls electric control system of hoist to stop hoist running, so as to prevent high coal piling wearing tail rope. Field test results prove reliability and practicability of the system.