Foods that are good for stomach cancer prevention include: 1, onion, ginger and garlic can prevent stomach cancer, especially garlic, which has the function of sterilization and can remove Helicobacter pylori in the stomach; 2, broccoli, cauliflower, purple kale, cabbage and tomatoes are good for stomach, among which, tomatoes contain lycopene and rich vitamins, which can reduce the free radicals produced in the stomach and can prevent stomach cancer; 3, the substance in onion has the function of directly killing cancer cells; 4, sweet potato can also prevent stomach cancer.