The invention discloses a precision static pressure linear guide rail, which is provided with a
bed piece and a sliding base for placing workpieces, wherein the bottom surface of the sliding base is fixedly provided with a sliding block, and a groove with a downward opening is formed in the sliding block; the position, which corresponds to the groove of the sliding block, on the
bed piece is fixedly provided with a guide rail which can be embedded into the groove of the sliding block; and the inner
peripheral wall of the groove of the sliding block is provided with a plurality of
lubrication grooves which are combined with the guide rail to form a
lubrication chamber, the inside of each of the
lubrication grooves is provided with a sealing element, and the lubrication grooves are communicated with an
oil supply mechanism through oil channels. Each oil channel for supplying oil for the lubrication grooves is provided with a
check valve. The sealing element arranged in the lubrication groove comprises a guide rail plate, a
metal frame and an O-shaped sealing ring, the guide rail plate is arranged on one side, which is close to a base surface of the guide rail, in the lubrication groove, the
metal frame is arranged between the guide rail plate and the groove bottom of the lubrication groove, and the O-shaped sealing ring is embedded into a sealing groove formed on the
metal frame. The precision static pressure linear guide rail only needs an oil source with small capacity to intermittently work, and radically eliminates heating phenomenon.