The invention discloses an electrolytic manganese residue innocent treatment method and a device thereof, belongs to the field of common industrial solid waste treatment, and aims to solve the problems that in an existing electrolytic manganese residue innocent treatment method, soluble manganese cannot be effectively utilized and manganese residue innocent treatment is in sore need of being realized. The electrolytic manganese residue innocent treatment method can be adopted to effectively realize innocent treatment on electrolytic manganese residues, and effectively solves the problem that electrolytic manganese residues are greatly accumulated and pollute the environment. The electrolytic manganese residue innocent treatment method is adopted to treat electrolytic manganese residues, sothat equipment investment cost is relatively small, energy consumption is relatively low, and treatment cost and operation cost can be effectively reduced. Meanwhile, the electrolytic manganese residue innocent treatment method is short in process flow, is stable in operation, is high in reliability, can meet industrial and large-scale production and application needs, has a relatively high application value and a relatively good application prospect in treating electrolytic manganese residues, and is worthy of being popularized and applied on a large scale. Besides, products treated by the electrolytic manganese residue innocent treatment method are stored and transported conveniently, use is wide, dosage is great, and economic values are relatively high.