Machine body guide rail assembly special for machine tool

The invention relates to the technical field of special machine tool body guide rail assemblies, and provides a special machine tool body guide rail assembly which comprises a guide rail assembly supporting frame, a screw rod and a machine body supporting plate, guide rail grooves are formed in the two ends of the guide rail assembly supporting frame and the two ends of the inner side of the guide rail assembly supporting frame, and the screw rod is installed in the guide rail assembly supporting frame; a servo motor is installed at one end of the screw rod, a movable block is installed on the outer side of the screw rod, and limiting plates are installed at the two ends of the movable block. The fixing shells are arranged at the two ends of the bottoms of the two sides of the machine body supporting plate and the two ends of the two sides of the limiting plate, in the moving process of the fixing shells, telescopic springs extrude connecting blocks, so that sponge blocks make contact with the guide rail groo