The invention discloses a cow leather treatment method. The cow leather treatment method includes the following steps that in the tanning and finishing process, cow leather wet blue skin is used as a raw material to be put into a revolving drum, the mass of the cow leather wet blue skin is used as a datum mass, 100%-200% of water is added at first and then 6%-16% of a polyurethane finishing agent is added for treatment; 1% of pigment is added for treatment by 1-2 hours; dewatering is performed and 8%-15% of grease is added for treatment by 1-1.5 hours at the temperature of 50 DEG C; treated cow leather is taken out, a vacuum ironing device is used for ironing the cow leather for 3-4 minutes at the temperature of 40 DEG C, and then the cow leather is taken out for suspending and drying; then water is sprayed onto the inner surface of the dried cow leather, and the moisture content of the cow leather is made to reach 10%-15%; and mechanical vibration is adopted for staking of the cow leather, the cow leather surface is decorated and ground flat, then color coating/spraying treatment is carried out, and accordingly the cow leather treated through the method can be obtained after ironing. According to the cow leather treatment method provided by the method, an elastic structure can be formed in collagen fibers of the treated cow leather, and the leather elasticity is improved.