The invention provides a combined type square hole blanking female die. The combined type square hole blanking female die comprises a die holder and a base plate installed on the upper surface of the die holder, wherein the base plate is provided with a plurality of positioning threaded holes in an equal interval mode. The combined type square hole blanking female die further comprises four cuboid die blocks; each die block is provided with countersunk installation holes, a cylindrical positioning hole and a rhombic positioning hole in the long edge direction; the four die blocks define a square cavity and are positioned and installed in the positioning threaded holes through countersunk screws, cylindrical positioning pins and rhombic positioning pins; and a stripper plate and stripper rods are further arranged in the square cavity. According to the combined type square hole blanking female die, the same set of die blocks can be conveniently assembled into square hole blanking female dies of various dimensions by arranging the positions of the die blocks, and the application range of the die is enlarged; the four edges, in the length directions, of each die block all can be used as cutting edges, and accordingly, the service life of the die is prolonged maximally; and the female die is assembled through the die blocks, so that the application amount of die materials is decreased, the stress concentration phenomenon at the corners of the overall female die is overcome, and meanwhile the design and manufacture of the female die are also simplified.