The invention relates to an extraction method for bioactive collagen. The method comprises: a pretreatment step, i.e. pretreating fresh bovine
tendon into fragments for standby use; an acid process crude extraction step, i.e. taking 1 part by weight of fragment, adding 4-8 parts by weight of an
acetic acid or
citric acid solution and conducting stirring, then carrying out coarse
filtration, performing high speed
centrifugation on a coarse filtrate, then taking the supernatant for standby use; a step of
end group removal by an
enzymatic process, i.e. adjusting the pH of the supernatant to 9.0, then adding 0.1-0.3% part by weight of Ficus proteinase to conduct enzymolysis
digestion; a gradient
salting-out step, i.e. using a precipitating agent to conduct multi-gradient
salting-out treatment on the solution subjected to enzymolysis to obtain a collagen dissolved solution; and a
dialysis step, i.e. loading the collagen dissolved solution into a
dialysis bag, using an
acetic acid solution and pure water as outer dialysate in order to conduct
dialysis, thus obtaining a collagen
stock solution with bioactivity. The method provided by the invention combines two existing collagen extraction processes, i.e. the acid process and the
enzymatic process, overcomes the low yield defect of the acid process and the incomplete
hydrolysis defect of the
enzymatic process, and adopts non-animal derived
protease, thus reducing the risk of
animal origin.