Antioxidant refining and purifying method of fish oil

The invention discloses an antioxidant refining and purifying method of fish oil, wherein the method comprises the following steps: S1, water washing pretreatment: adding water and compound protease into crude fish oil, heating and stirring, completing enzymolysis, carrying out heating enzyme deactivation treatment, adding a degumming agent for degumming treatment after enzyme deactivation treatment, adding an adsorbent and water into the crude fish oil, heating and stirring; and then adding an alkaline solution, heating and stirring again to finally obtain deacidified fish oil, removing fatty acid of a low-carbon chain part and remaining a high-carbon chain part, and repeatedly degumming and deacidifying for 2-3 times to obtain deacidified and degummed fish oil. The method has the beneficial effects that the fish oil is poured into a hydrotreating reaction box for hydrotreating, and nitrogen treatment is performed through a nitrogen treatment reaction box, so that fatty acid of 14-18 carbon chain segments of