Human body existence sensor

The utility model discloses a human body existence inductor which comprises a front cover structure, a circuit board and a bottom shell structure which are connected in sequence. The front cover structure allows infrared rays emitted by a human body to enter the circuit board; the bottom shell structure is provided with a containing cavity located in the middle of the bottom shell structure and a wire outlet hole located in the middle of the top end of the bottom shell structure, the circuit board is arranged in the containing cavity of the bottom shell structure, and the circuit board is communicated with an external power source through the wire outlet hole; battery limiting grooves are formed in the top end and the bottom end of the bottom shell structure, and the bottom shell structure is connected with the outside in a matched mode through the battery limiting grooves. With the adoption of the embodiment of the utility model, an enterprise only needs to produce one bottom shell structure, so that the fun