The invention discloses a high-energy dissipation road asphalt material and a preparation method thereof. The road asphalt material is prepared by blending matrix asphalt, a thermoplastic elastomer, a plasticizer and a cross-linking agent, wherein the mass ratio of the matrix asphalt, the thermoplastic elastomer, the plasticizer and the cross-linking agent is 100: (4-6): (3-5): (0.1-0.3). The high-energy dissipation road asphalt material further has relatively high resistance to high-temperature deformation and low-temperature cracking and high elastic restorability besides relatively high energy dissipation within a relatively large temperature range and a relatively large frequency range; various indexes of the high-energy dissipation road asphalt material meet relevant standard requirements of an asphalt material, and particularly, the high-energy dissipation road asphalt material has a relatively good application prospect in wide high-temperature and rainy areas, high-frequency braking areas, and design of a structural interlayer on a bridge deck brick pavement and a cement pavement.