A flowing water-type sterile water aquaculture method comprising the following steps: (a) a farming water supply step for collecting freshwater or seawater and supplying it as farming water; (b) an oxidant generation step for generating oxidant in the supplied farming water through the electrolysis method, in which titanium or niobium is used as a substrate metal; freshwater or seawater is electrolyzed by an anode that is coated to have a thickness of 0.1-30 μm with ruthenium, iridium, tantalum, platinum, or an oxidant thereof; and a voltage between 2.51 and 4.4 V is applied to the electrolysis method such that bromate is generated with a concentration of 10 ppb or less; (c) a sterilization step for letting oxidant remain in the continuously flowing farming water and for sterilizing fish-harming germs in the farming water; (d) a neutralization step in which a neutralizer is input in the sterilized under continuously flowing farming water, and the oxidant is reduced such that the concentration of the residual oxidant in the farming water becomes 0.06 ppm or less; (e) a sterile farming water supply step for supplying the sterilized and neutralized farming water to a fish farming water tank; and (f) an aquaculture wastewater discharge step for discharging wastewater from the fish farming water tank, wherein steps (c) and (d) are carried out in two to eight compartmented chambers (310, 320, 430, 440, 450, 460, 470, 480), whereas the farming water is led or pumped in the compartmented chambers, flows in one direction, and sequentially undergoes the sterilization step (c) and the neutralization step (d) in the compartmented chambers, and wherein the chambers (310, 320, 430, 440, 450, 460, 470, 480) has a structure in which farming water flows continuously up and down through alternately placed partition walls, wherein a lower part of a partition wall is open in a given height and an upper part of the next partition wall is lowered in a given height, and such placement is repeated for a few times, such that the farming water flows over the upper part of a partition wall to the lower part of the next partition wall, flows through the lower part of the partition wall to the upper part of the next partition wall, and flows over the upper part of the partition wall to the lower part of the next partition wall. (a) a farming water supply step for collecting freshwater or seawater and supplying it as farming water; (b) an oxidant generation step for generating oxidant in the supplied farming water through the electrolysis method, in which titanium or niobium is used as a substrate metal; freshwater or seawater is electrolyzed by an anode that is coated to have a thickness of 0.1-30 μm with ruthenium, iridium, tantalum, platinum, or an oxidant thereof; and a voltage between 2.51 and 4.4 V is applied to the electrolysis method such that bromate is generated with a concentration of 10 ppb or less; (c) a sterilization step for letting oxidant remain in the continuously flowing farming water and for sterilizing fish-harming germs in the farming water; (d) a neutralization step in which a neutralizer is input in the sterilized under continuously flowing farming water, and the oxidant is reduced such that the concentration of the residual oxidant in the farming water becomes 0.06 ppm or less; (e) a sterile farming water supply step for supplying the sterilized and neutralized farming water to a fish farming water tank; and (f) an aquaculture wastewater discharge step for discharging wastewater from the fish farming water tank,