The present invention discloses an oxygenation device for an aquaculture tank group and a control method, and belongs to the technical field of aquaculture equipment. The oxygenation device for the aquaculture tank group includes a controller, a speed regulator, a fan and a buffer tank which are successively connected； an outlet of the buffer tank is connected with a main gas guiding tube, the main gas guiding tube is branched into a plurality of branch gas guiding tubes, a tail end of each branch gas guiding tube is connected with an oxygenation hole, each oxygenation hole is placed in a corresponding aquaculture tank, each aquaculture tank is placed in a pond, automatic oxygenation control over numerous flowing water aquaculture tank groups may be realized, and oxygen supply of aquaculture tanks may remain stable automatically when a water level of a water area of the pond changes due to weather variations or human factors. Moreover, a use method of the device is simple, and after an aquaculture plan is established, oxygenation of each aquaculture tank only needs to be adjusted once. In addition, the device is low in cost, expensive meters such as an adjusting valve and a dissolved oxygen sensor are reduced, and the oxygenation device for the aquaculture tank group is easy to popularize actually.
