In order to solve the problem that the absolute vibration displacement is difficult to directly measure in many engineering practices, a novel quasi-zero-stiffness-based sensor system is proposed. Firstly, the static characteristics of the Euler beam and the sensor system are analyzed and the condition of the quasi-zero-stiffness characteristic of the sensor system at equilibrium position is obtained. Secondly, the dynamic model of sensor system is established and solved, and then the effects of equivalent damping, stiffness ratio of compressed Euler beam and spring, the amplitude of measured signal on the measurement accuracy are discussed. Thirdly, the time-domain responses under different excitation signals are studied. The results show that the sensor system can be used to measure the absolute micro-vibration displacement directly, accurately and real-timely. The novel quasi-zero-stiffness sensor system should be a feasible or better measurement scheme for various vibration control with full system states feedback.