Soft contact type soil pressure sensor and soil pressure sensor calibration method

The invention discloses a soft contact type soil pressure sensor and a soil pressure sensor calibration method. The soil pressure sensor comprises a soft contact layer, a piezoresistive sensitive element, a sensor main shell, a pagoda type anti-breaking structure and a threaded protection shell. A soil pressure sensor is in soft contact with a soil body contact surface, an arc-shaped cylindrical sensor main shell is filled into the soil body contact surface through opening a window on the front surface, a soft contact layer on the surface of the soil pressure sensor deforms and bends under the influence of an upper filling soil layer to form a shape flush with the sensor main shell, and soil pressure acts on a piezoresistive sensitive element; the soft contact layer of the soil pressure sensor is made of the high-elasticity material, the density of the high-elasticity material is between that of dry sand and that of saturated sand, and compared with an aluminum alloy material and a stainless steel material, t