[Problem] To provide a more practical construction technology related to a manufacturing method and a manufacturing device for an animal excrement treatment material. [Solution] The present invention includes: a granulating step (S100) a sorting step (S200) at which granules are sorted by a sieve (B100) to form an animal excrement treatment material and a quality control step (S300) that includes an extracting step (S400) at which a sample is extracted, a comparison data calculating step (S500) at which the surface area per unit weight of the sample is obtained, and a sieve replacement step (S700) at which the sieve (B100) is replaced on the basis of the comparison data.
