Abstract: In view of problems of inconvenient measurement, time consuming, high labor intensity and uncontrollable errors of existing cross-measuring methods of surface displacements of mine roadway, a laser measuring device of surface displacements of mine roadway was designed. Based on the principle of laser ranging, the device uses laser range finder to complete measurement of cross centering and deformation, and can measure surface displacements of the roof, floor, left and right sidewalls of each testing station in roadway respectively by single laser range finder. The underground test results show that the device realizes cordless measurement with high measuring efficiency, accurate results, and accuracy up to 1 mm, which meets requirements of mine.