Abstract: Collagen was extracted from zeolite and TWS tanned waste leather chips using the dilute acid method, and the extraction process was optimized using the extraction rate and characteristic viscosity number as indexes, and the purified collagen hydrolysates were characterized. Subsequently, the collagen hydrolysate extracted from TWS-tanned waste leather chips (C-TWS) was blended with polybutylene terephthalate (PBAT) to form films, and the film-forming properties of the mixture were investigated. Results show that the two collagen hydrolysates contained 17 amino acids, and the elemental composition was dominated by C, N, and O with low mineral salt content, and they are high-quality biodegradable protein substrates. The blending process of PBAT/C-TWS was a simple physical blending one, and the increase of C-TWS content could lead to the increase by 43.05%-182.5% in the water vapor transmission rate of the composite film. When the content of C-TWS component was 30%, the maximum thermal degradation temperature of the resulting film was reduced from 405.4 ℃ to 386.5 ℃, and all the proportions of the blended films had good light transmittance. The blended system had better compatibility when the content of C-TWS component was less than 50%.