Method for purifying type I collagen

The invention relates to the technical field of collagen purification, in particular to a method for purifying type I collagen. The method for purifying the type I collagen comprises the following steps: S1: adopting a proper method to extract the type I collagen; S2: obtaining a type I collagen dilute solution; S3: obtaining the purified type I collagen. Compared with the prior art, the method for purifying the type I collagen has the advantages that the purification time of the type I collagen can be obviously shortened, and an ideal purification effect can be achieved. According to the method, only 12-24 hours are required for an ultrafiltration purification technology to purify the collagen to achieve required purification and concentration, but time of about one week is required for the dialysis method purification of the prior art to achieve the same purity and concentration. The method for purifying the type I collagen has the characteristics of simple method, convenience in operation and low productio