The invention relates to a metallurgical auxiliary material product, in particular to metallurgical auxiliary material core-wrapped blocks and a production device thereof, and belongs to molten iron alloy treatment. The core-wrapped blocks are characterized by being composed of core materials, flexible wrapping films and rigid wrapping covers; press-fit edges are arranged at the two ends, and the core-wrapped blocks are in a lump shape; the diameter ranges from 60 mm to 350 mm; the grain size of the core materials is smaller than 50 mm; the vacuum degree of flexibly-wrapped blocks is smaller than or equal to 200 pa. The production device is formed by connecting a feeding belt, a feeding device, a block mold, a mold conveying chain belt, a vacuum flexible wrapping device, a flexibly-wrapped block conveying device, a rigid wrapping device and a finished product conveying belt. Metallurgical auxiliary materials are conveyed to a feeding bin through the feeding belt, pushed by a feeding screw to be fed, charged into the mold and packaged into the flexibly-wrapped blocks in a flexible wrapping mode in a vacuum chamber; the rigid wrapping device wrap performs roll wrapping, press fit and cutting so that the core-wrapped blocks can be formed. The core-wrapped blocks have the advantages of being novel in concept, small in superficial area, good in sealing performance and metallurgical function, convenient to transport, store and use and high in recovery rate, lowering loss and reducing environmental pollution. The production device is compact in structure, reasonable in arrangement, convenient to operate and high in finished product yield.