Freezing temperature sensor and measuring method thereof

The invention provides a freezing temperature sensor and a measuring method thereof. The invention is suitable for carrying out fixed-point measuring on the freezing temperature of different soil bodies under different pressure conditions. The freezing temperature sensor is mainly composed of an insulating terminal, a copper sheet, a copper lead wire, a heat-sensitive resistor, a heat-sensitive resistor lead-out wire, a reference resistor and a DC voltage source. The DC voltage source, the reference resistor and the copper sheet are connected in series by the copper lead wire. A freezing temperature sensor probe which is arranged at the position to be measured is connected with the copper lead wire and the heat-sensitive resistor lead-out wire by a data collector, and measures the differential pressure value and the temperature of a point to be measured in the soil body in real time. The freezing temperature sensor has the characteristics of simple structure, low cost, simple as well as convenient operation,