The invention discloses a numerically-controlled linear guide rail chamfering machine, comprising a base; a guide rail clamping mechanism is mounted on the base; a guide rail bracket is arranged on one side of the guide rail clamping mechanism, while a chamfering mechanism is arranged on the other side of the guide rail bracket; a transverse X-axis linear sliding table is mounted on the base, a vertical Y-axis linear sliding table is mounted on a moving seat of the X-axis linear sliding table, and longitudinal a Z-axis linear sliding table is mounted on a moving seat of the Y-axis linear sliding table; moreover, the chamfering mechanism is mounted on a moving seat of the Z-axis linear sliding table. In such a numerically-controlled linear guide rail chamfering machine, the X, Y and Z linear sliding tables are matched with the guide rail clamping mechanism to position a guide rail, and automatic chamfering is performed on end faces of the linear guide rail along a section curve of the linear guide rail; in such a manner, the chamfering machining accuracy and the production efficiency are greatly improved, the labor intensity of a worker is reduced, and the improvement of the production efficiency and quality of the linear guide rail is facilitated.