The invention provides a microwave sterilization system. The microwave sterilization system comprises microwave sterilization devices for performing microwave sterilization on products, an ultraviolet sterilization device for performing ultraviolet sterilization on products, and a sealing device for sealing products, wherein the microwave sterilization devices, the ultraviolet sterilization device and the sealing device are sequentially arranged, and the microwave sterilization system also comprises a conveyer belt for transporting the products, the conveyer belt penetrates through the microwave sterilization devices and the sealing device, and the ultraviolet sterilization device and the sealing device are both located at outlets of the microwave sterilization devices. The microwave sterilization system disclosed by the invention integrates microwave sterilization, exhaust sealing and ultraviolet sterilization, and a processing technology of firstly performing microwave sterilization on plastic bagged foods and then performing sterile sealing while the plastic bagged foods are hot is effectively realized, so that the sterilization time is effectively shortened, the sterilization effect and the sterilization efficiency are improved, bag explosion caused by microwave sterilization is avoided, besides, heat exhaust sealing can be realized, the degree of vacuum in cans can be increased, and the oxygen content is reduced. The device is high in sterilization speed, assembly line type production is convenient, the production efficiency is effectively improved, and the eating quality of bagged canned foods can be improved.