NOVELTY - Method for manufacturing ferroferric oxide-cobaltosic oxide porous magnetic composite material, involves adding bivalent cobalt salt and bivalent ferric salt to mixed solvent, adding urea and sodium citrate to the above mixture, stirring the mixture to obtain yellowish brown solution, heating the above solution to obtain precipitate, cooling and filtering the precipitate, washing the precipitate with water until the precipitate becomes neutral, vacuum-drying the precipitate to obtain nonporous yolk-shell material, and sintering the above material.    USE - The method is useful for manufacturing ferroferric oxide-cobaltosic oxide porous magnetic composite material used in lithium ion battery and fuel battery (claimed).    ADVANTAGE - The method simply, rapidly and inexpensively prepares ferroferric oxide-cobaltosic oxide porous magnetic composite material with uniform particle size and shape, and high yield. The porous magnetic composite material has excellent magnetic property.    DETAILED DESCRIPTION - Method for manufacturing ferroferric oxide-cobaltosic oxide porous magnetic composite material, involves (a) adding bivalent cobalt salt and bivalent ferric salt to mixed solvent, adding urea and sodium citrate to the above mixture, stirring the mixture to obtain yellowish brown solution, where the mass ratio of bivalent cobalt salt, bivalent ferric salt, urea to sodium citrate is 1:0.36-0.65:1-2:0.84, the mixed solvent is a mixture of water, ethanol and butanol with a volume ratio of 100-150:100:0.1-5, and the ml/g ratio of mixed solvent to bivalent cobalt salt is 1:0.01-0.016, (b) heating the above solution at 100-200 degrees C for 114 hours to obtain precipitate, (c) cooling and filtering the precipitate, washing the precipitate with water until the precipitate becomes neutral, and vacuum-drying the precipitate at 60 degrees C until the precipitate reaches a constant weight to obtain nonporous yolk-shell material, and (d) sintering the above material at 200-500 degrees C for 0.5-3 hours.