The invention provides a breeding net cage, and relates to the technical field of mariculture. The breeding net cage comprises a flexible floating frame device, a net device and drooping weight devices; the flexible floating frame device can float on the sea surface, and multiple sets of anchoring devices are connected with the surrounding portion of the flexible floating frame device; the top ofthe net device is connected with the flexible floating frame device, the net device is strutted under the sea surface to form a space used for breeding marine organisms, and multiple sets of droopingweight devices are connected to the bottom of the net device. The problems that an existing net cage is complex in structure and high in cost and can be easily damaged by sea wave impacting are effectively solved.