The invention discloses optical mirror surface polishing equipment. The optical mirror surface polishing equipment comprises a machine body, flexible cable driving devices, a moving platform, a mirrorsurface polishing device and an active supporting device. A moving platform lifting device is fixed on the machine frame and is used for pulling a platform through the flexible cable driving devices.The mirror surface polishing platform is installed on the movable platform and is driven by two motors and three synchronous belts, so that the mirror surface polishing platform can achieve translation of two degrees of freedom on the movable platform. An ion beam emitter is connected with the mirror surface polishing platform through three rotating pairs, a fixing long rod, two electric push rods and three spherical hinges, and the two degrees of freedom of the ion beam emitter can be rotated. The driving supporting device with the full floating support is fixed on the machine frame. A mirror surface supporting system is applied to optical machining, so that the machining difficulty can be effectively reduced, and the machining period is shortened. A series-parallel polishing machine bedcan realize the large machining space, larger rigidity and small accumulative error.