The invention provides a rubber material used for preparing packer rubber cylinders, and a preparation method thereof. The rubber material is prepared from, by mass, 36 to 50% of hydrogenated butadiene acrylonitrile rubber, 12 to 33% of spray carbon black, 1 to 14% of pyrolysis carbon black, 3 to 14% of nano white carbon black, 3 to 19% of pottery clay, 1 to 9% of a plasticizer, 0 .5 to 2% of an anti-aging agent, 0.5 to 2% of a vulcanizing agent, and 1 to 4% of a cross-linking accelerator. The preparation method comprises following steps: hydrogenated butadiene acrylonitrile rubber, spray carbon black, pyrolysis carbon black, nano white carbon black, pottery clay, the plasticizer, and the anti-aging agent are subjected to primary mixing to obtain a masterbatch; the masterbatch, the vulcanizing agent, and the cross-linking accelerator are subjected to secondary mixing so as to obtain the rubber material with high temperature resistance and high pressure resistance. The beneficial effects are that: the rubber material is capable of tolerating server working environment with a high temperature of 177 DEG C and a pressure difference of 105MPa.