A novel quasi-zero stiffness vibration isolator is presented and tested in this article. The isolator is mainly made of air spring and permanent magnet. The stiffness effect between them is mutually restrained to form a quasi-zero stiffness state. Firstly, the force-displacement relationship and the stiffness-displacement relationship of the isolator is established to reveal the static characteristics. The influences of isolator parameters on the system stiffness are also analyzed. Then, the dynamic transmissibility characteristics are calculated by the harmonic balance method. The results shows that the proposed quasi-zero stiffness isolator is superior to the normal air spring isolator over the isolation frequency range by regulating the damping radio or excitation amplitude in a suitable range. Finally, the dynamic experiments is employed to verify the vibration isolation performance. This research provides a new reference for small amplitude or even micro-vibration isolation.