A rolling knuckle bearing angle decoupling and magnetic levitation plane driving location vibration isolator belongs to the technical field of precision vibration isolation. A sleeve of a vibration isolator main body and a lower installation plate are carried by magnetic levitation functions of a magnetic levitation plane motor, lubrication and supporting between a piston cylinder and the sleeve are carried out through an air floatation face, freedom of angular motion between the upper installation plate and the lower installation plate is decoupled through a rolling knuckle bearing, and a position closed loop feedback control system is formed by the motor, a displacement sensor, a limit switch, a controller and a driver to accurately control relative locations of the upper installation plate and the lower installation plate. The vibration isolator has characteristics of zero three-dimensional stiffness, high positional accuracy and angular decoupling, can obtain low inherent frequency and prominent low frequency and ultra-low frequency vibration isolation performance, and can effectively solve high-performance vibration isolation problems of ultra-precise measurement device and processing equipment, in particular to a step scanning photoetching machine.