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This utility model provides a microwave sterilization device suitable for aquaculture, belonging to the field of aquaculture technology. It includes a flow-slowing mechanism comprising a buffer tank, a converging tube, and a long tube. The inlet of the buffer tank is connected to the aquaculture system, the expanded end of the converging tube is connected to the outlet of the buffer tank, and the long tube is connected to the contracted end of the converging tube. A microwave mechanism includes a microwave housing and a microwave transmitter. The microwave housing is connected to the long tube, and the microwave transmitter is located on both sides of the inner cavity of the microwave housing. Microwave sterilization can penetrate relatively turbid water and kill Escherichia coli, Vibrio, Aeromonas, etc., in aquaculture ponds with high sterilization efficiency. It utilizes the non-thermal effect of microwaves for sterilization, achieving low-temperature sterilization without heating the water to a high temperature.