Novel hydrostatic guideway device applied to heavy gantry machine tool

The utility model relates to a novel hydrostatic guideway device applied to a heavy gantry machine tool, and belongs to the technical field of machine tool accessories. The guide rail structurally comprises a sliding plate, a main guide rail and an auxiliary guide rail, wherein the main guide rail and the auxiliary guide rail are arranged in parallel; the lower portion of the sliding plate is of an unclosed rectangular groove structure, the unclosed rectangular groove is in sealing fit with the four faces of the main guide rail, and each sealing face is provided with a plurality of concentric-square-shaped oil cavities. The upper portion of the sliding plate is of an L-shaped structure, the L-shaped structure is in sealing fit with three faces of the auxiliary guide rail, and each sealing face is provided with a plurality of concentric-square-shaped oil cavities. And each rectangular-ambulatory-plane oil cavity is connected with a hydraulic system. The hydrostatic guideway device adopts a plurality of concent