The invention relates to the technical field of seawater ecological breeding, in particular to a double-circulation seawater prawn comprehensive breeding system. The system comprises a prawn breedingpond, a sludge treatment tank, a first-stage surface flow constructed wetland, a second-stage composite vertical flow constructed wetland, a shellfish and alga biological filter and a reservoir, wherein the prawn breeding pond, the sludge treatment pond, the first-stage surface flow constructed wetland, the second-stage composite vertical flow constructed wetland and the reservoir are sequentiallycommunicated; the shellfish and alga biological filter is in parallel connection with the first-stage surface flow constructed wetland and the second-stage composite vertical flow constructed wetland, and is also in serial connection with the first-stage surface flow constructed wetland and the second-stage composite vertical flow constructed wetland; secondary deep treatment can be carried out when necessary, economical tidal flat crabs and tidal flat fishes are bred in the sludge treatment tank, and filter-feeding fishes, shellfishes and snails are bred in the first-stage surface flow constructed wetland. The system can effectively filter away residual bait, excrement and the like in prawn breeding discharged water, can purify nitrogen, phosphorus and other pollutants, has good ecological benefits, is low in overall energy consumption and saves energy.