The utility model discloses a hydrostatic bearing for an optical plane polishing machine tool. The hydrostatic bearing for the optical plane polishing machine tool mainly serves as a rotating bearing of an ultra-precision machining polishing machine tool and also serves as a rotating shaft of a similar machine tool. The main technical scheme of the hydrostatic bearing that a round boss turnplate and a middle turnplate are connected to form a rotating body; the rotating body is connected with a polishing disc; the middle turnplate is mounted in a column-shaped space between a lower pressing disc and an L-shaped bearing pedestal; and gaps are reserved on two sides of the space of the middle turnplate so as to form a hydraulic friction pair through hydraulic oil. The probation of the hydrostatic bearing shows that defects that the original plane polishing machine tool does not adapt to machining of high-precision optical components and the production efficiency is low, are overcome fundamentally. Ultra-precision machining of various plane optical components is realized, the production efficiency is effectively improved, the cost is reduced, and the requirement on mass production is met.