Auxiliary reference gauge block for clamp of horizontal machining center

The invention relates to a reference block, in particular to an auxiliary reference gauge block for a clamp of a horizontal machining center. The reference gauge block is a square matrix; the bottom surface of the reference gauge block is parallel to a horizontal plane; each lateral surface of the reference gauge block is perpendicular to the horizontal plane; and an included angle between the adjacent lateral surfaces is 90 degrees. The auxiliary reference gauge block has the advantages that when workpieces are clamped every time, workers need to detect distance between the workpieces and the reference block, and if the distance is inaccurate, the position of a positioning support point on the clamp is regulated to ensure that the workpieces are installed accurately every time. Therefore, by the auxiliary reference gauge block, the phenomenon of the scrapping of the workpieces due to inaccurate installation of the workpieces is avoided, waste is reduced, and the production benefit is improved.