The invention relates to a novel heat insulation material and a preparation method thereof. The raw material components are composed of the following proportions in parts by weight: 30-50 parts of seaweed mud, 10-20 parts of plant fiber, 5-15 parts of nano-ceramic hollow microspheres, 5‑10 parts of vitrified bead insulation mortar, 3‑8 parts of redispersible latex powder, 6‑10 parts of seaweed powder, 5‑9 parts of putty rubber powder, 3‑5 parts of talcum powder, 3‑5 parts of pregelatinized starch 5-10 parts of nano silicon, 6-10 parts of polyvinyl alcohol, 20-50 parts of deionized water, 30-35 parts of ceramic powder. The material of the present invention is easy to obtain, the preparation method is simple, the maximum can withstand -50-180 °C, the insulation effect is good, and the wear resistance is strong. By electroplating ceramic powder, not only the hardness of the surface is improved, but also the absorption of sunlight can be prevented, and the heat insulation can be improved. Effect, the internal structure has high viscosity and tight combination, and it is not easy to burst and peel after exposure to the sun. The surface is smooth, healthy and environmentally friendly, reducing water absorption, low cost, and high comprehensive economic benefits.