The invention discloses a proximity sense sensor device for contact state test of lift buffer and lift car, comprising a lower support opened with a first pin hole at the middle thereof; wherein the first pin hole is internally provided with a pin roll, the pin roll is internally opened with a second pin hole and the second pin hole is internally provided with a return spring, a pressure plate isarranged at the top surface of the lower support and is sheathed at the top part of the pin roll, the upper support is internally opened with a touch buttonhole, a micro motion touch button which is composed of a touch button, a shading rod section opened with a groove thereon and a lower cylinder section sequentially is arranged in the touch button hole and the second pin hole, the bottom of thelower cylinder section is pressed at the top of the return spring, the upper support is internally provided with a U-shaped photoelectric sensor with a infrared-emitting diode and a infrared receiving tube, the infrared-emitting diode and the infrared receiving tube are respectively arranged at the two sides of groove of the shading rod section, and the connection terminal of the infrared receiving tube is connected with the signal input terminal of an oscillator or a data acquisition circuit. The device is simple in structure, large in stroke, good in dynamic response, rapid in reset and high in precision.