Sensor for measuring rock mass stress

The invention belongs to the technical field of sensors and discloses a sensor for measuring rock mass stress. The sensor comprises a circular support ring, an arc-shaped sensitive element and an electric resistance strain gauge; an inner side of the circular support ring is provided with two fixed parts that are symmetric about a circle center of the ring, two ends of the arc-shaped sensitive element are respectively connected to the two fixed parts, and the electric resistance strain gauge is fixed on the arc-shaped sensitive element. The invention provides the sensor capable of improving sensitivity of rock mass stress measurement.