The invention relates to the technical field of aquaculture, and discloses a seawater crab industrialized breeding method which comprises the following steps: carrying out egg-carrying breeding on parent crabs to obtain egg-carrying crabs; transferring the egg-carrying crabs into a hatchingbarrel to obtain larvae; transferring the larvae into a seedling culture pond for seedling culture until seedlings emerge; a slow-release bactericide is adopted for egg-carrying crab and larva breeding, the slow-release bactericide is prepared from a film-forming solution and foamy copper, and the film-forming solution is prepared from polyvinyl alcohol, benzalkonium bromide, a solvent and sorbitan monostearate; according to the parent crabs bred through the method, the egg carrying rate can reach 85% or above, the embryonic development synchronization rate can reach 95% or above, the embryonic development speed is remarkably increased, and the surface parasite and sticky dirt phenomena are remarkably reduced; the slow-release bactericide adopted by the method has a continuous bactericidal effect, can continuously provide a stable bactericidal effect, and can reduce the dosage, reduce the seedling culture cost and improve the seedling culture efficiency.