In the field of low-frequency vibration isolation， aiming at the issues of insufficient bearing capacity of linear system and stiffness hardening and instability caused by nonlinear jump of traditional quasi-zero stiffness vibration isolation system， a mechani? cal model of the bionic limb-like quasi-zero stiffness isolation system was established by using the bionic limb-like structure as the negative stiffness element and the positive stiffness spring in parallel. The static characteristics of the system were analyzed； A dy? namic model was established based on the Lagrangian equations， and the harmonic balance method was used to analyze the dynam? ics equations of the system analytically； Through theoretical analysis and experimental research， the isolation characteristics of lin? ear and traditional quasi-zero stiffness isolation system and bionic limb quasi-zero stiffness isolation system were compared and ana? lyzed， as well as the influence of excitation amplitude on the isolation performance and stability characteristics of the system. The results show that compared with the linear system and the traditional quasi-zero stiffness isolation system， the bionic limb-like qua? si-zero stiffness isolation system not only ensures the system has a higher bearing capacity， but also effectively reduces the displace? ment transmissibility and expands the vibration isolation through the design of structural parameters. The frequency bandwidth im? proves the stability and vibration isolation performance of the system in complex excitation environments.