The invention relates to a compound culturing system in a shrimp pool, in particular to a compound space culturing method for large varech in the shrimp pool; Sargassum thunbergii is cultured on the surface layer of the water body of the shrimp pool; gardon asparagus and/or gulfweed are cultured in the middle layer of the water body; Zosteraceae is transplanted in the bottom layer of the water body; and the surface layer of water body refers to the location of 0 to 30cm under water surface and the bottom layer of water body refers to the location of 50 to 150cm below the water surface. The method fully utilizes the limited space in the shrimp pool, not only has remarkable economic benefits, but also plays remarkable role of improvement on the environment of the shrimp pool.