Abstract: In order to solve the problems of low accuracy and cumbersome operation of traditional coal mine shaft guide deformation detection methods, a coal mine shaft guide deformation detection device based on 2D laser scanner is designed. When the cage moves linearly along the shaft guide, the pulley that connected to the cage through the support arm and closely attached to the shaft guide rotates, driving the coaxial mileage encoder that closely connected with the pulley to rotate and generate a trigger signal. Then the controller receives the trigger signal and starts the 2D laser scanner fixed to the cage. The 2D laser scanner emits laser to scan the shaft guide, and the laser projected on the surface of the shaft guide is diffusely reflected and then received by the 2D laser scanner to obtain the scan data of the shaft guide. The scan data of the shaft guide is transmitted to the controller, and the host computer calls the scan data in the controller and processes it. It can draw the shaft guide outline online and the 3D model of the shaft guide offline to obtain the gap width between the two shaft guides, the misalignment value in each direction and the wear amount of a single shaft guide. Therefore, the deformation of the shaft guide is determined. The experimental results show that the maximum absolute error of the device is 0.6 mm, and the maximum relative error is 10%. The device has the characteristics of high measurement accuracy, simple operation and simple structure.