The present invention discloses a tunnel deformation monitoring system, which includes: a laser distance measuring instrument, disposed on a side wall of a maximum horizontal width of a tunnel, and configured to measure the width of a cross section of the tunnel; a surveillance camera, disposed on the laser distance measuring instrument, and configured to view the scene of the tunnel; a control and transmission device, configured to receive a control command and control the laser distance measuring instrument and the surveillance camera, and receive monitoring data of the laser distance measuring instrument and video data acquired by the surveillance camera; and a remote control terminal, configured to send a control command to the control and transmission device, receive the monitoring data and the video data, and analyze and display the monitoring data and the video data.