Leather coating agent and preparation and application method thereof

The invention discloses a leather coating agent and a preparation and application method thereof. The coating agent is prepared from, by weight, 15-25% of diisocyanate, 30-40% of polyhydric alcohol, 2-4% of small-molecular dihydric alcohol, 35-45% of organic solvent, 1-5% of compression change powder, 0.3-1.0% of termination agent, 0.15% of antioxidant and 0.20% of silicone oil. After Base leatheris coated with the coating agent, the leather is roasted at 110-140 DEG C for 3-8 min, then immersed in water and subjected to water kneading treatment for 20-45 min and secondary drying, and after the leather is dried, thermal compression treatment is conducted. The compression change powder is heated and carbonized and turns black for color development, for the part after thermal compression, the compression change powder is carbonized and turns black, color development is not conducted on the part without thermal printing, under the contrast, obtained characters and patterns are extremelyclear, and the leather coa