The invention discloses a production method for a low-shrinkage-rate wool fabric. The production method comprises the specific steps that 1, a wool fabric is humidified and pre-heated, and then an octadecyl trimethyl ammonium chloride water solution is atomized to be mixed with air to conduct secondary humidifying and pre-heating on the wool fabric; 2, the wool fabric obtained after humidifying and pre-heating is subjected to ozone treatment, after pressure increasing and maintaining treatment, freezing is conducted, a graphene-grafted polymer water solution is atomized and then mixed with nitrogen, the mixture of the graphene-grafted polymer and the nitrogen is pre-heated, injected into a container and subjected to ultrasonic oscillation; 3, the wool fabric is taken out and subjected to fixation by using a high-temperature and low-temperature combined method; 4, the wool fabric is pre-dried, baked and then subjected to water washing and drying, and if the wool fabric is qualified through quality testing, the wool fabric is packaged to obtain the low-shrinkage-rate wool fabric. According to the method, the wool fabric is treated, the shrinkage rate of the wool fabric can be remarkably reduced, the shrinkage resistance of the wool fabric can be improved, the dimensional stability of the wool fabric is improved, and therefore, the application requirements of the wear field are met.