NOVELTY - A ship ballast water is produced by filtering process comprising adding ballast water to ballast cabin from output port, removing plankton and suspended particulates, and resisting corrosion of seawater using filter screen; and inactivating through re-injection type electrolytic process comprising flowing water across electrolytic bath, where chloride ions in loading water are oxidized at positive pole, reducing hydrogen ions at negative pole to generate hydrogen gas, and uniformly mixing to obtain sodium hypochlorite (5-10 ppm), and killing harmful residual water-based creatures.    USE - Method for processing ship ballast water.    ADVANTAGE - The method is simple, and has good processing effect.    DETAILED DESCRIPTION - The ship ballast water is produced by effective filtering process, and inactivating through re-injection type electrolytic process. The effective filtering comprises:    (A) connecting in series automatic back-washing plate type or mesh type filter with filter accuracy of 30-40 mu m with output port;    (B) adding ballast water using ballast pump to ballast cabin from output port;    (C) removing plankton and the suspended particulates of greater than 30-40 mu m; and    (D) resisting corrosion of seawater using filter screen having 2-phase stainless steel or other mesh materials, where flow rate of the filter is the same as that of the ballast water.    The inactivating through re-injection type electrolytic process comprises:    (A) using booster pump for pumping part of loading water from water inlet general pipe at outlet port of filter in process of loading ballast water;    (B) flowing water across electrolytic bath, where chloride ions in loading water are oxidized at positive pole of electrolytic bath to rapidly generate chlorine gas dissolved in loading seawater, and sodium hypochlorite;    (C) reducing hydrogen ions at negative pole to generate hydrogen gas (H2), where sodium hypochlorite with high concentration and H2 flow to hydrogen-removing pot to remove the hydrogen, and sodium hypochlorite solution with high concentration is re-injected to water inlet general pipe through booster pump; and    (D) uniformly mixing to obtain concentration of sodium hypochlorite to 5-10 ppm, and killing harmful residual water-based creatures.