The work aims to make better use of the resource of pig’s tendons to improve the added value and widen the application of collagen in packaging, and study the preparation of collagen sponge from pig’s tendon and its adsorption performance for ethanol. Through the single factor experiment, the effects of concentration of collagen from pig’s tendons, glycerol content and casting thickness on the mechanical properties were studied. Then, the effects of sponge porosity and time on the adsorption performance for ethanol were studied. When the mass fractions of collagen and glycerol were respectively 1% and 0.6% and the casting thickness was 5 mm, the tensile strength of sponge prepared was 210.91 kPa and the elongation at break was 6.98%, the porosity of sponge prepared under such technological conditions was 91.19%, and the adsorption quantity for ethanol was 416.32 mg/g at 30 d. Besides, the adsorption quantity was positively correlated with the porosity of the sponge. The tensile strength of collagen sponge from pig’s tendon prepared under such technological conditions is higher than that of other animals, and the sponge has the adsorption effect on ethanol.