Based　on　the　design　of　a　post-buckling　silicone　gel　column　(SGC),　a　novel　type　of　low-frequency　vibration　isolator　is　presented,　and　the　vibration　isolation　performance　of　this　isolator　is　studied　by　combining　theoretical　analysis　and　experimental　verification.　The　stiffness　characteristics　of　the　post-buckling　SGC　are　derived,　and　its　recovery　force　curves　with　different　parameters　are　analyzed　using　two　kinds　of　elliptic　integral　functions.　Displacement　transmissibility　is　formulated　using　harmonic　balance　method　(HBM),　and　the　influences　of　the　excitation　amplitude,　damping　ratio,　SGC　section　diameter,　and　Young＇s　modulus　are　discussed　in　terms　of　the　transmissibility.　The　performance　of　the　SGC　system　is　verified　through　a　series　of　experimental　studies　based　on　the　developed　experimental　prototype.　The　result　shows　that　the　proposed　post-buckling　spring　vibration　isolator　has　a　good　vibration　isolation　effect,　especially　in　the　low-frequency　domain,　which　may　provide　a　feasible　novel　design　idea　for　a　low-frequency　vibration　isolator.