The main materials of microwave oven liner are stainless steel liner, nano-silver liner and ceramic liner. Among them, the stainless steel liner has the advantages of super heat resistance, strong guided wave performance, strong acid and alkali resistance, healthy magnetization, bacteriostasis, no oil pollution and easy cleaning. Nano-silver liner can kill a variety of pathogenic bacteria without starting, and its sterilization ability is as high as 99%. Ceramic liner has good heat insulation and corrosion resistance.