Deep-sea fish collagen peptide hydrogel

The invention provides deep-sea fish collagen peptide hydrogel. A preparation method of the deep-sea fish collagen peptide hydrogel comprises the following steps: (1) dissolving 3g-5g of collagen peptide powder into 100ml of a PBS buffer solution; (2) adjusting the pH value to 6-7.4; (3) adding 30ml of nitrogen-nitrogen dimethylformamide into 100ml of a collagen peptide solution, and adequately stirring for dissolving; (4) adding 4ml-5ml of triethylamine, stirring until triethylamine is adequately dissolved; (5) adding 8ml-10ml of methacrylic anhydride, stirring for one night until methacrylic anhydride is adequately dissolved; (6) intermittently stirring to react for 3 days; (7) carrying out dialysis for three days by virtue of a dialysis bag with a molecular weight of 1000D, and intermittently changing water; (8) after dialysis, putting a peptide solution into a dish, and carrying out pre-freezing; (9) putting the dish into a freeze dryer, and carrying out freeze-drying; and (10) collecting and storing powd