Provided are a method and an apparatus for manufacturing an excrement treatment material, with which it is possible to obtain an excrement treatment material that contains grains of different diameters in a mixed manner, without executing a mixing step. The manufacturing method includes a granulation step. The granulation step is a step of forming a plurality of granules by performing extrusion granulation on a granulation material using a granulation machine (10). The granulation machine (10) includes a die (12). A plurality of through holes (13) that allow the granulation material to pass therethrough are formed in the die (12). The plurality of through holes (13) include through holes (13a) having a first diameter, and through holes (13b) having a second diameter that is smaller than the first diameter.
