The invention disclose an axially movable hydrostatic bearing device, comprising a shaft, a flat key, a saw blade locating ring, left end covers, a hydrostatic thrust bearing, right end covers, a hydrostatic bearing seat, saw blades, a saw blade fixing ring and a sealing ring. The saw blade fixing ring is fixed to the right side of the saw blade locating ring with countersunk head screws, and the hydrostatic bearing is in clearance fit to a groove on the saw blade locating ring through two right semicircular end covers; the hydrostatic bearing is connected to the right end covers with the countersunk head screws, and the outside of the hydrostatic bearing is fit to the bearing seat, and sealed at a contact surface with the sealing ring; the inside of the hydrostatic bearing is provided with a pressure oil cavity and a return chute, and fit to the saw blade locating ring; the left end covers are connected to hydrostatic bearing pins, and connected to the bearing seat with the countersunk head screws; the inside groove of the saw blade locating ring is fit to the flat key on the shaft, not only can move synchronously with the shaft, but also can move axially along the flat key. The hydrostatic bearing device disclosed by the invention can move axially during rotation of the saw blades, and the problems of big error and low efficiency of manual adjustment and shutdown adjustment are solved.