This　study　proposes　a　novel　nonlinear　low-frequency　vibration　isolator　with　quasi-zero　stiffness　(QZS)　based　on　a　symmetric　link-rod-type　structure.　The　principle　of　the　isolator　is　analyzed,　and　the　properties　of　the　vibration　isolator　are　investigated　experimentally.　Varying　displacements　with　a　restoring　force　and　stiffness　are　acquired　by　a　static　model;　thus,　the　QZS　conditions　and　system　contributing　factors　are　elucidated.　Various　effects　of　the　excitation　amplitude,　damping　ratio,　rod　length　ratio,　and　initial　spring　compression　ratio　on　the　displacement　transmissibility,　which　are　determined　using　the　harmonic　balance　method　(HBM),　are　discussed.　Through　a　series　of　experiments　on　the　isolator　prototype,　the　performance　of　a　QZS　vibration-isolation　system　with　a　symmetric　link-rod-type　structure　is　validated.　The　results　indicate　that　the　presented　symmetric　link-rod-type　QZS　vibration　isolator　has　a　wider　QZS　interval,　lower　frequency　of　vibration　isolation,　and　better　isolation　performance,　providing　a　valuable　reference　for　the　design　of　QZS　vibration　isolators.