The utility model relates to a two-dimensional non-coupling nano-motion platform mechanism, belonging to the technical field of nano-grade displacement output and positioning. The two-dimensional non-coupling nano-motion platform mechanism comprises a movable platform, an inner frame and an outer frame which are connected by flexible guiding connection rib plates in an interlaced mode to form an integral structure, i.e. the flexible guiding connection rib plate is connected between a symmetrical frame of the inner frame and the movable platform, and the flexible guiding connection rib plate is connected between the other symmetrical frame of the inner frame and the outer frame the other pair of frames between the movable platform and the inner frame and between the movable platform and the outer frame are respectively and symmetrically provided with a piezoelectric porcelain driver and a pretightening driving spring and the piezoelectric porcelain driver is connected with an outer controller. The utility model adopts the connecting structure of the separated frames and the flexible rib plates, thereby ensuring that the XY axial motion is independent, realizing the stable and accurate guidance of platform motion and having simple and compact integral structure. The driving mode of combining the piezoelectric porcelain driver and the pretightening driving spring can reach nano/subnano driving displacement resolution ratio, reduce the driving control design difficulty of the platform, and improve the integral assembling ability and the controllability of the platform.