Humic acid is an organic substance that can form complexes with metal ions. In these complexes, humic acid plays a role in stabilizing metal ions, thereby prolonging the service life of metal ions. Humic acid has strong hydrophilicity and ion exchange capacity, and can form complexes with calcium and magnesium ions in water, reducing the hardness of water, thereby preventing the formation of scale. In addition, humic acid also has strong antioxidant properties, which can be used to prevent oxidative deterioration of oils, food and other substances, and maintain their quality and shelf life.