The present invention provides a method for producing a dry earthworm powder, which is not only at no risk of decreasing the enzymatic activity of earthworm, but also can increase the enzyme activity of the dry earthworm powder thus obtained. In this method of producing a dry earthworm powder, earthworms are subjected to the treatment of dirt removal for use as the raw material for manufacturing the dry earthworm powder. In particular, after the treatment of dirt removal, the living earthworms or their crushed matters are subjected to a pressurizing treatment at a pressure of 10 ~500MPa and a temperature of 0 ~ 70 DEG C, and the pressurized earthworms or their pulverized matters are used as the raw material of the dry earthworm powder.本發明提供一種蚯蚓乾燥粉末的製造方法，其不僅沒有蚯蚓的酶活性下降之虞，而且可以使所得到之蚯蚓乾燥粉末的酶活性增大。在將經糞土去除處理之蚯蚓作為原料製造蚯蚓乾燥粉末之蚯蚓乾燥粉末製造方法中，對經糞土去除處理之蚯蚓的活體或其粉碎物，進行在10~500MPa的壓力條件且0~70℃的溫度條件下的加壓處理，並將該加壓處理後的蚯蚓或其粉碎物作為蚯蚓乾燥粉末的原料。
