The invention discloses a wedge rubber material for a polywedge belt of an automobile. The wedge rubber material comprises the following substances by weight: 100 parts of chloroprene rubber, 4 to 6 parts of magnesium oxide, 1 to 2 parts of stearic acid, 1 to 5 parts of an antioxidant ODA, 5 to 8 parts of multifunctional masterbatch, 30 to 40 parts of carbon black, 10 to 15 parts of conductive carbon black, 0.1 to 3 parts of carbon nanotubes, 10 to 20 parts of nylon short fiber, 5 to 10 parts of aromatic hydrocarbon oil, 5 to 8 parts of zinc oxide and 1 to 3 parts of an antistatic agent. The invention also provides a preparation method for the wedge rubber material. The wedge rubber material has low electrostatic voltage value and good dynamic fatigue and service life; and the belt maintains low electrostatic voltage value in the whole life span.