Food spoilage is a natural phenomenon that protein, fat and other ingredients in food are decomposed by microorganisms such as bacteria and molds to produce peculiar smell, stench and toxic compounds, rather than food pollution. Food pollution refers to harmful substances entering food through different channels, which leads to the decline of food quality and harms human health. Food pollution will bring harm to human health, including affecting the sensory characteristics of food, causing acute food poisoning, causing acute and chronic harm to the body, and having teratogenic, mutagenic and carcinogenic effects on the human body.