Abstract: The preparation and properties of starch-protein-PVA membrane (SCP membrane) were studied. Using corn starch as raw material and hydrogen peroxide as oxidant, on the basis of mixing oxidized starch and polyvinyl alcohol, formaldehyde was used as cross-linking agent and collagen degradation product extracted from waste leather scraps to prepare rapid water-absorbing swelling film. The water absorption properties were tested. According to the orthogonal experiment, the optimum scheme of the composite membrane is: 10 g collagen degradation product, 25 g polyvinyl alcohol (PVA), temperature 70 ℃, pH=9.0. Taking the water absorption as the index, the order of the influence degree of each factor on the composite membrane was as follows: CD dosage ＞PVA dosage ＞temperature ＞pH. Secondly, the structure of the composite membrane was characterized by Fourier Infrared Spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC) and Thermogravimetric (TGA).