Disclosed is linear guide rail pair for numerically-controlled machine tool

Disclosed is a linear guide rail pair for a numerically-controlled machine tool. Guide rail and sliding block, the sliding block is slidably mounted on the guide rail; a sliding rail groove is formedin the sliding block; a first rolling groove, a second rolling groove, a first roller path and a second roller path are arranged in the sliding rail groove; a first rolling piece is arranged in the first rolling groove, and a second rolling piece is arranged in the second rolling groove. The first rolling piece and the second rolling piece are vertically arranged; the sliding block is supported through the first rolling piece, the second rolling piece and the balls on the first roller path and the second roller path; the supporting capacity of the sliding rail can be effectively improved; a temperature sensor is arranged in the center of the top of the sliding rail groove; the temperature sensor is arranged to detect the temperature in the linear guide rail pair in real time, so that the linear guide rail pair alw