Preparation process of chrome tanning-free pigskin top-layer shoe lining leather

The invention belongs to the field of preparation process of shoe lining leather and particularly relates to a preparation process of chrome tanning-free pigskin top-layer shoe lining leather, comprising the following steps (starting from a picked skin germ, the additive amounts of additives of all procedures take the mass of picked skin as a standard): pickling for softening, tanning, degreasing for softening, neutralizing and dyeing and fatliquoring. The invention provides the preparation process of the chrome tanning-free pigskin top-layer shoe lining leather, which has the advantages that steps are simple, preparation efficiency is high, the preparation process is low in requirement on equipment and energy-saving and environment-friendly, and the prepared shoe lining leather has the advantages of being wear-resistant, high-temperature-resistant, plump and soft.