The present invention provides a zinc-manganese battery mixture automatic filling method. The method comprises the steps of: battery casing loading operation, battery mixture pretreatment operation, primary battery mixture filling operation, second battery mixture filling operation, battery mixture refill filling operation and battery casing blanking operation. The zinc-manganese battery mixture automatic filling method performs battery casing loading operation, the battery mixture pretreatment operation, the primary battery mixture filling operation, the second battery mixture filling operation, the battery mixture refill filling operation and the battery casing blanking operation for the battery so as to complete the filling operation of the battery mixture, and employs a hierarchical filling mode to perform battery mixture filling for the battery casing to prevent the battery mixture from overflow and improve the processing precision.