Abstract: The disclosure relates to 433 MHz solid state microwave heating cavity and industrial defrosting system. The 433 MHz solid state microwave heating cavity and industrial defrosting system includes a sample conveying device, a metal detector, a microwave processing system, and a motor, provided on a machine frame. An upper part and a bottom part of a microwave processing module are provided with a microwave source separately. Microwave sources are connected to bell mouths through wave guide tubes. Two bell mouths are connected to a heating cavity through microwave windows. The microwave source is a 433 MHz solid-state microwave source. The high-power-density 433 MHz microwave is used to penetrate meat products to make a uniform temperature inside and outside after defrosting, the defrosting takes only 2-4 minutes from ?18° C. to ?2° C., color and nutrients of the meat products after the defrosting are basically the same as those of fresh meat.