The invention relates to a die-casting forming die for a bottom corner of an antenna support. The die-casting forming die comprises an upper die body and a lower die body. Connecting section A grooves are obliquely and symmetrically formed in the four corners of the lower die body, a raised thread connecting hole structure A is arranged at the center of each connecting section A groove, and the two center connecting lines of the diagonal connecting section A grooves and the diagonal lines of the lower die body are overlapped. Connecting bulges are obliquely and symmetrically arranged on the four corners of the upper die body, and the connecting bulges and the connecting section A grooves are matched to form die cavities of the bottom corner of the antenna support. Raised thread connecting structures B are arranged at the centers of the two sides in the diagonal line extending directions of the connecting bulges correspondingly, and the two center connecting lines of the diagonal connecting section bulges and the diagonal lines of the upper die body are overlapped. The die-casting forming die has the advantages that a plurality of products can be produced through the die, thus the production efficiency of the products is improved, meanwhile, the utilization rate of the die is also increased, and the production cost can be reduced greatly; and meanwhile, uniform force-bearing is also guaranteed, and the quality of the products is improved.