The utility model provides a high-sensitivity active vibration sensor. The active vibration sensor is of a tube shape; the height of the active vibration sensor is not more than 170 mm, and the diameter thereof is not larger than 55 mm; a coil of the sensor is coiled by a thin varnished wire, the diameter of which is not larger than 0.04 mm; the resistance value thereof is not less than 5 kilohms; and transduction sensitivity is not less than 100 V*S/m. An outer tube of the active vibration sensor is connected with magnetic steel in the tube and an outer circle of a spring strip; the center of the spring strip is connected with the coil of the sensor; the coil of the sensor is connected with the input end of an amplification circuit; the outer tube is connected with a measured object; and when the measured object vibrates, the magnetic steel has relative movement with the coil, induced electromotive force is generated, and after the amplification of the amplification circuit, vibration signals are output. The advantages of the high-sensitivity active vibration sensor are that the coil is wound through the extremely-thin varnished wires, so that the active vibration sensor is best in sensitivity in the same size of vibration sensors; the high-sensitivity active vibration sensor has four paths of amplification channels; and when transmission wires are long, the signal to noise ratio is improved, and detection range is enlarged.