NOVELTY - Solar energy distillation device comprises an upper surface structure, a lower surface structure, a raw water inlet, a distilled water outlet and a sewage outlet. The upper surface structure and lower surface structure form a sealed accommodation cavity. The upper surface structure is coated with a hydrophilic coating. The lower surface structure is coated with a hydrophobic coating. The sewage flows into the raw water inlet. The sunlight irradiates the upper surface structure, which causes evaporation of water in the accommodation cavity to the hydrophilic coating on upper surface structure.    USE - The solar energy distillation device is useful for preparing distilled water (claimed).    ADVANTAGE - The device: solves the problem of fogging droplets; comprises surface structure, treated by hydrophilic treatment using super-hydrophilic coating process; reduces the contact angle of water film is adhered to the device, such that the sunlight can be successfully passed, to increase the evaporation efficiency; comprises hydrophobic treated lower surface structure, which increases the contact angle of water and reduces the scale formation and accumulation, thus enabling continuous operation of the device with high working efficiency.    DETAILED DESCRIPTION - Solar energy distillation device comprises an upper surface structure, a lower surface structure, a raw water inlet, a distilled water outlet and a sewage outlet. The upper surface structure and lower surface structure form a sealed accommodation cavity. The upper surface structure is coated with a hydrophilic coating. The lower surface structure is coated with a hydrophobic coating. The sewage flows into the raw water inlet. The sunlight irradiates the upper surface structure, which causes evaporation of water in the sealed accommodation cavity to the hydrophilic coating on the upper surface structure to form water film to be discharged via the distilled water outlet. The hydrophobic coating absorbs the sewage layer by the lower surface structure to be discharged via the sewage water outlet. An INDEPENDENT CLAIM is also included for preparing the distilled water using solar energy distillation device, comprising (a) preparing upper surface structure having hydrophilic coating by (a1) hydrophilic treatment to the inner surface of the substrate in the upper surface structure, (a2) coating acidic layer having a pH of 3-6 on the substrate inner surface, comprising 6% partially hydrolyzed tetraethoxysilane ethanol solution, drying at 100-150 degrees C for two hours, forming a protective layer comprising polycarbonate and titanium dioxide to prevent photocatalytic decomposition of hydrophilic coating, and (a3) mixing nano-titanium dioxide solution, tetra isopropyl titanate, hydrogen peroxide and water in a volume ratio of 20:80:200, adjusting the pH to 7, refluxing for 15 hours to obtain titanium dioxide of anatase crystalline nano-dispersed solution, coating the substrate with tetraethoxysilane of titanium dioxide solution with repeated immersion, impregnating with an interval of 2-5 seconds, taking out and drying at 80-100 degrees C for 30 minutes, repeating for 2-4 times to form upper surface structure with hydrophilic coating layer, (b) preparing lower surface structure having hydrophobic coating by (b1) preparation hydrophobic reagents by uniformly mixing trimethoxymethylsilane, 1,2-diethoxysilyl ethane, ethanol and water in a volume ratio of 5:2:180:13, adjusting the pH to 2-3, and activating at 60 degrees C for 3 hours, (b2) impregnating the heat absorption plate in a hydrophobic agent, taking out and drying, repeating for two times, drying at 100-150 degrees C, and forming lower surface structure with a hydrophobic coating, and (c) integrating the upper surface structure and lower surface structure to form the containing cavity to form sealed accommodation cavity.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the solar energy distillation device for preparing distilled water.