The invention relates to rubber and a preparation method thereof, in particular to PVC-blended regenerated rubber and a preparation method thereof. The PVC-blended regenerated rubber has the characteristic of being mainly prepared from the following raw materials: in parts by weight, 90-100 parts of regenerated rubber, 5-10 parts of high-styrene glue, 1-3 parts of zinc oxide, 5-10 parts of PVC, 1-2 parts of stearic acid, 1-2 parts of an accelerator, 1.5-2.5 parts of an anti-aging agent, 3-5 parts of pine tar and 40-60 parts of plant fiber. After multiple tests are conducted on the prepared product, the tensile strength is 7.1-7.8 MPa, the elongation at break is 576%-593%, the hardness is 67-72 Shore A, and all technical indexes meet the requirements of national standards; and after numerous tests are conducted, it is found that the tensile strength, elongation at break and hardness can be improved significantly through addition of PVC, and an unpredictable, unexpected and good effect is achieved.