The invention relates to a measuring system for the stress of a rock and earth mass. The measuring system comprises a stress measuring unit wherein the stress measuring unit is connected with a signal conversion unit through a signal transmission unit; the signal conversion unit is connected with a data processing unit; the data processing unit is connected with a man-machine interaction interface; and the measuring unit adopts a membrane type sensor. The measuring system can reduce the perturbation of the sensor and a lead wire to the internal nature of a medium material, eliminate the convex points produced during the stress measuring process to carry out the high-precision stress measurement, and meanwhile, conduct the real-time and automatic acquisition, transmission, processing, recording and output of data.