Aiming at the requirements of the space station optical clock for ultra-static environment, ultra-static active vibration isolation technology suitable for the complex disturbance environment of the space station is studied. First, a fault-tolerant low-frequency active vibration isolation unit is designed based on non-contact voice coil actuators and low-stiffness springs. The proposed active vibration isolation unit can simultaneously meet requirements of the broadband vibration isolation and the fundamental frequency in launch stage. Then, the detailed design of the electronic control system is given, and the high-bandwidth micro-force driver and high-precision signal conditioning circuit is independently developed. Furthermore, an anti-saturation control algorithm is designed to address the control saturation problem induced by low-frequency disturbances. Finally, the ground suspension verification results and space station verification results of the developed vibration isolation unit are given. The experimental results illustrate that the developed platform can achieve can achieve a micro-vibration suppression effect of better than 98.5% in three directions. The micro-vibration level of the upper platform is suppressed less than 10μg under broadband disturbances of space station.