The utility model relates to a tunnel supporting structure automatic monitoring device based on steel frame stress recognition, belongs to the field of tunnel structure safety monitoring, and solves the problems that an existing conventional monitoring device is easily interfered by construction and does not have real-time performance, and data processing and signal transmission are lagged. The automatic monitoring device provided by the utility model adopts an integrated sensor; a resistance type strain sensor of the integrated sensor is adhered to a steel frame of the supporting structure; strain of the steel frame is monitored, strain signals are converted into current signals through an internal circuit of the steel frame, the current signals are transmitted to the single-chip microcomputer signal processor, and the single-chip microcomputer signal processor sets different thresholds and controls the instruction lamps of the green color, the yellow color and the red color to emit corresponding light signals according to the current signals output by the resistance-type strain sensor. According to the utility model, the accurate monitoring of the stress change of the tunnel supporting structure and the real-time transmission of safety signals are realized, the safety of the working environment in the tunnel is improved, and the occurrence of major accidents can be avoided.