Inner corner square hole refractory brick mold

The utility model relates to the technical field of inner corner square hole refractory brick production, in particular to an inner corner square hole refractory brick mold which comprises a mold shell, an inner corner square hole and an inner corner square hole. The lower die holder is matched with the lower end of the inner cavity of the die shell, and a mounting groove is formed in the upper end surface; the combined mold core is positioned in the inner cavity of the mold shell, and the lower end part of the combined mold core is matched with the mounting groove; the upper die base is arranged at the upper end of the inner cavity of the die shell in a matched mode and provided with a first receding opening matched with the upper end of the combined die core, and a clamping groove is formed in the corner of the lower end face of the upper die base; and the upper end part of the upper movable block is matched with the clamping groove. Due to the fact that the cavity of the inner corner square hole refractory