The utility model discloses a temperature sensor applied to a battery pack. The temperature sensor comprises a fixed seat, a probe embedded on the fixed seat, and a circuit board fixed on the back surface of the fixed seat, the input end of the circuit board is electrically connected with the probe, and the output end of the circuit board is used for being electrically connected with an external controller; the back surface of the fixed seat is an installation surface installed on a to-be-measured body, and the probe is used for sensing the temperature of the to-be-measured body. According tothe temperature sensor, the probe is embedded in the fixing base, the risk that the probe is broken due to external force in the manufacturing process is avoided, and compared with an existing mode that the probe and the circuit board are welded firstly and then injection molding is conducted, the temperature sensor is simple in manufacturing process, small in equipment investment and low in manufacturing cost.