Fish scale collagen and preparation method and application thereof, and ice cream rich in fish scale collagen and preparation method of ice cream

The invention belongs to the technical field of food processing, and particularly relates to a fish scale collagen and a preparation method and application thereof, and an ice cream rich in the fish scale collagen and a preparation method of the ice cream. The preparation method of the fish scale collagen includes the steps that fish scales are put in an acid solution for decalcifying to obtain decalcified fish scales; water is added to the decalcified fish scales, and fish gelatin is extracted under heating condition to obtain fish gelatin extract; solid-liquid separation is carried out on the fish gelatin extract to obtain fish gelatin; and the fish gelatin is sequentially in contact with alkaline protease and trypsin to be hydrolyzed separately to obtain the fish scale collagen. The fish scale collagen prepared by the preparation method has high proteolysis degree and soluble protein content, the fish scale collagen can be used in the production of ice cream, pomegranate and grape fruit pulp are added, the