The present invention provides a high-precision granite aerostatic slideway, and belongs to the technical field of air hydrostatic guideways. U-shaped grooves are formed in the middle of the upper endface and the middle of the lower end face of the granite aerostatic slideway, the two U-shaped grooves are oppositely arranged and penetrate through the front end face and the rear end face of the granite aerostatic slideway, a dragging plate is provided with a chute, each of the left side and the right side of the dragging plate are respectively provided with four first threaded holes formed ina matrix mode, each of the upper end surface and the lower end surface of the dragging plate is respectively provided with two second threaded holes, the two second threaded holes located at the upperend face of the dragging plate and the two second threaded holes located at the lower end face of the dragging plate are arranged in the front and back direction of the dragging plate, all the firstthreaded holes and all the second threaded holes communicate with the chute, an adjusting screw rod is screwed in each first threaded hole and each second threaded hole, the adjusting screw rods are used for attaching aerostatic blocks to the granite slideway, and each adjusting screw rod is locked and fixed through nuts. The high-precision granite aerostatic slideway can ensure that the detectionresult has micron-order precision due to the fact that the device has high precision.