The phagostimulant specially for river crab and its preparation process belongs to the field of aquatic animal additive technology. The phagostimulant consists of methionine, leucine, arginine, glycine, tyrosine, garlicin, rhubarb, asafetida and freeze dried powder of enzymolyzed animal insides. Adding the phagostimulant in 0.3-2 wt% into feed for river crab can increase the ingested amount of river crab, promote its growth, and reduce feed waste and water pollution. The preparation process of the phagostimulant includes mixing the said ingredients in certain weight proportion and stirring in a stirrer.