Leather degreasing refers to the process of removing fat, grease and other organic substances on the surface and inside of leather by physical or chemical methods during leather processing. Its purpose is to make leather more uniform, breathable, soft and easy to process. In the process of animal life, leather will produce some fats and oils. These organic substances in leather will affect the permeability and softness of leather, and also affect the adsorption of tanning agent and the dyeing effect of leather.