The invention provides a method for improving under fur pressure resistance and application and product thereof. According to the method for improving under fur pressure resistance, a specific technology is adopted, a finishing agent is sprayed on under furs subjected to temperature rising pre-treatment, and then cooling treatment is conducted on the under furs, so that the under fur pressure resistance is effectively improved, the under furs are made to be stored or transported for a long term, the under furs or a manufacturing product made of the under furs are not damaged, the under furs are made to be flexible and bright, and the use value and the economic value of the under furs are remarkably improved. The method for improving the under fur pressure resistance can be used for improving the pressure resistance of the fur under furs and is applicable to various furs; the technology is simple, the cost is low, and the effect is good; and the under fur product is free of damage, natural, loose, flexible and bright, the under furs and the manufacturing product made of the under furs cannot be damaged by long-term storage or transporting, and the use value and the economic value are high.