The invention discloses a method for breeding a California sea cucumber fry. The method comprises the steps of 1, a parent sea cucumber, wherein the parent sea cucumber is ripened, the gonad indexes of half of the individuals are higher than 15%, and half of the individuals are normal in posture, no damage, no eversion of viscera and no abnormalities; 2, spawn and incubation; 3, juvenile sea cucumber selecting and breeding; 4, seedling collection; 5, young sea cucumber breeding; 6, juvenile sea cucumber breeding and developing; according to the method, through a series of studies such as the reproductive adjustment, ripening and breeding for the parent sea cucumber, spawn collection and incubation, juvenile sea cucumber selecting and breeding, seedling collection and young and juvenile sea cucumber developing, specific implementation steps of breeding California sea cucumber fry are formulated, and the method is beneficial for the development of sea cucumber.