The frying temperature of the advanced vacuum frying machine should be lower than 95℃, which avoids the problem of waste oil produced by the high temperature of the previous generation vacuum frying (80 ~ 120℃). Because of the low temperature of vacuum frying, it is not suitable to use electricity as heating means, and a large amount of waste oil will be produced at high temperature, which is clearly stipulated in the industry standard of fruit and vegetable chip equipment. At the same time, the large-capacity vertical vacuum frying machine also has many shortcomings, such as serious deoiling and heating problems, which lead to poor initial expansion of fruit and vegetable chips, high oil content and immature industrialization of the large-capacity vertical vacuum frying machine.