The invention discloses a preparation method of an edible animal collagen casing. The preparation method comprises the following steps: a, material preparation: cleaning and splitting
animal skin; b,material treatment: performing alkali treatment on the split
animal skin, adding water according to a weight ratio of the
animal skin to the water of 1:1, performing
enzyme treatment with
protease, cleaning the animal
skin, and then, performing
acid treatment; c, preparation of
fiber pulp: cooling the animal
skin after
acid treatment to be lower than 10 DEG C,
cutting up the animal
skin by means of dicing, tabletting, chopping and
grinding or a combination mode thereof, rolling the
cut animal skin into sheets, and extracting
silk fiber by means of
high pressure filtration; d, preparation of collagen pulp: adding edible
cellulose or edible
cellulose derivates and
grease emulsion while stirring, controlling pH value and
water content, and performing uniform mixing and stirring to form a collagen group; e, preparation of casing: freezing the collagen group, performing
extrusion to spray a tubular substance,
drying the tubular substance, and adding a curing agent and a plasticizing agent for treatment; f: curing and forming: curing and shaping the casing for 6 hours at 82 DEG C; and g: defect detection: detecting whether the casing is broken or not by using a casing detection device.