Combined type net cage

The invention discloses a combined type net cage which comprises a gravity net cage with an inflatable floating frame at the top, wherein an upper isolation mesh is arranged at the bottom of the gravity net cage; the gravity net cage is connected with a disk-shaped net cage without a center vertical column through a traction rope; a lower isolation mesh is arranged at the top of the disk-shaped net cage. The inflatable floating frame is submerged through exhausting, so that stormy wave attacks can be effectively avoided. After the inflatable floating frame is submerged, a net of the gravity net cage is shrunk into a net collector or is arranged near an outer edge of the lower isolation mesh. The two isolation meshes are opened, so that fishes can well escape from impact of stormy waves and water flow after diving into the disk-shaped mesh cage. Therefore, the combined type net cage has the advantages of high stormy wave flowing resistance, convenience in bait feeding and management, large breeding spring layer area and low requirement on reliability of an anchoring system.