The aluminum alloy heat insulation board for the engine can effectively prevent the high temperature generated by the engine from transferring to the surrounding components, protecting the surrounding parts from the influence of high temperature and prolonging their service life. Its surface is hemispherical, which greatly increases the surface area. This unique design is more conducive to the dissipation of heat, thereby improving the heat insulation effect and enabling the engine to work in a more suitable temperature environment, ensuring the performance and stability of the engine.