The invention provides a back spring lower vibration isolator structure for a multi-linkage type back independent suspending frame, comprising a swaying arm, a back suspending spring and a vibration isolator, wherein the vibration isolator is arranged on the swaying arm, and the back suspending spring is arranged on the vibration isolator; the vibration isolator comprises a metal framework and a rubber layer coated at the outer surface of the metal framework; the metal framework comprises a tubular center pillar and a convex disk connected to the outer surface of the tubular center pillar; the convex disk is perpendicular to the tubular center pillar; the back suspending spring is arranged on the convex disk. The back spring lower vibration isolator structure has the beneficial effect that the limiting and supporting functions of the vibration isolator to the back suspending spring can be enhanced through optimizing the structure of the vibration isolator.