The utility model discloses a casting defect melting filling device, including the platform, it places the mechanism to set up foundry goods fixed establishment, welding mechanism, grinding machanism and melting material on the platform, welding mechanism include the strut with the welder that the activity set up on the strut, the melting material is placed the mechanism and is included the cell body, the cell body passes through the baffle and sets up the bowl classifier, corresponds the bowl classifier is in set up the label on the baffle, welder is connected with the casting defect repairing machine. The utility model provides a repair platform of casting defect can be fixed defective foundry goods and carry out the melting restoration on the platform, can just classify to the melting material and place nearby to foundry goods restoration when not leading to the fact the injury to the foundry goods body, has improved the efficiency and the quality of the salvage of casting, and simple structure is for the huge benefit of company's creation.