The invention discloses a method for breeding parental coreius guichenoti by hull in-situ flowing water. The method includes steps: (1) hull transformation, to be more specific, transforming a fishingor transporting ship with tonnage and cabin area into a tank for parental fish domestication; (2) hull placement, to be more specific, placing a transformed hull offshore, and keeping the hull stableand keeping smoothness in water exchange of the tank; (3) parental fish collection and breeding, to be more specific, selecting injury-free robust individuals from coreius guichenoti captured by fishermen, subjecting to disinfection treatment with strong chlorine, and releasing into the tank; (4) feeding with feed, to be more specific, feeding with feed in morning and evening; (5) fish disease prevention, to be more specific, in flood seasons, feeding with medicinal bait, and adding vitamins on the basis of the feed; pouring strong chlorine which is a sterilization and disinfection medicine to the tank to prevent diseases. The method is feasible, convenient and simple in operation, defects of proneness to death and poor gonad development of parental coreius guichenoti bred in ponds, net cages, indoor circulating water systems and the like are effectively overcome, and a solid foundation is laid for success of artificial propagation.