The invention discloses a temperature sensor, which comprises a shell body and a sensing probe, wherein the bottom part of the shell body is fixedly connected with the sensing probe, the sensing probe is internally provided with a thermistor, the thermistor is located in the very center of the sensing probe, a power supply is arranged inside the shell body, one side of the shell body is provided with a control switch, the power supply is electrically connected with a central processor by means of the control switch, the central processor is electrically connected with the thermistor, the central processor is arranged just below the power supply, the central processor is electrically connected with a speech chip, the speech chip is electrically connected with loudspeakers, the number of the loudspeakers is two, and the two loudspeakers are arranged on both sides of a display screen separately, the front surface of the shell body is provided with the display screen, and the display screen is electrically connected with the central processor. The temperature sensor solves the trouble of connecting an external power supply through the integral design of the shell body and the power supply, the circuit is positioned inside the shell body, and the temperature sensor is more intelligent by arranging the speech chip.