As a new material for food preservation, deoxidizers have unique advantages. It is packed in the same container as food, and the deoxidizer absorbs the oxygen in the container, leaving the container in an anaerobic state, allowing the food to be preserved. But the raw materials of the deoxidizer must have stable reaction, no peculiar smell, and no harmful gas generation and other side effects. In case of ingestion, it is also harmless to the human body. Deoxidizers generally use iron powder as the basic raw material and are used in general food to maintain food quality and extend shelf life. When used in healthy food, they can prevent oil oxidation, fade, and maintain nutrients. The deoxidizer has been widely used abroad in wet bread flour, wet noodles, wet vermicelli, wet Dim sum, semi dry fish products and other foods. The form of deoxidizer is not only in bags, but also in hats. Bags are used for bagged food, while caps are used for containers such as bottles and cans. In recent years, with the development of the food industry and the improvement of packaging materials, deoxidizers have been increasingly valued and widely used in China.