Solar distillation device based on interface evaporation and water purification method

The invention provides a solar distillation device based on interface evaporation and a water purification method. The device comprises a hemispherical transparent cover body, an interface evaporation platform located in the hemispherical transparent cover body, a condensate water collecting assembly located below the hemispherical transparent cover body, a water quality sensor located on the interface evaporation platform, a water body conveying assembly, a water body discharging assembly, a supporting frame and a floating platform, wherein the interface evaporation platform comprises a tray, an interface evaporation material located on the tray, a water inlet located in the center of the tray and water outlets located in the two sides of the tray respectively, two ends of the water body conveying assembly are respectively connected with the water inlet and a natural water body, two ends of the water body discharging assembly are respectively connected with the water outlets and the natural water body, a wat