Small displacement analog quantity sensor

The invention discloses a small displacement analog quantity sensor which is applied to the technical field of displacement sensors. Comprising a sensor shell, an electronic shaft, an iron core assembly, a coil assembly, an amplifier circuit and a processing module, the electronic shaft is connected with one end of the iron core assembly, the other end of the iron core assembly enters a cavity of the sensor shell through an opening of the sensor shell, the coil assembly and the iron core assembly are coaxially arranged between the sensor shell and the iron core assembly, and the coil assembly, the amplifier circuit and the processing module are sequentially connected. Wherein the processing module comprises an analog quantity output unit, an AD conversion unit and an LED display unit, the input end of the analog quantity output unit is connected with the amplifier circuit, the output end of the analog quantity output unit is connected with the input end of the AD conversion unit, and the output end of the AD