NOVELTY - Multi-effect sleeve-type solar freshwater generator with light focusing function, comprises a shell (2), a sleeve (5), a water filling tank (3), a solar condenser (1), a light ray collector, a heating pipe, a connecting pipe, a freshwater output pipe and a water storage tank. The shell is a cylindrical devacuumized shell. The water filling tank is a round shell with an opening along the shaft. The water filling tank and sleeve are arranged in the shell. An evaporation-condensing cavity (4) is formed by a space, which is not filled with water between water filling tank and sleeve or shell.    USE - Used as a multi-effect sleeve-type solar freshwater generator with light focusing function.    ADVANTAGE - The freshwater generator can evaporate sea water by maintaining a vacuum state by vacuum pump.    DETAILED DESCRIPTION - Multi-effect sleeve-type solar freshwater generator with light focusing function, comprises a shell (2), a sleeve (5), a water filling tank (3), a solar condenser (1), a light ray collector, a heating pipe, a connecting pipe, a freshwater output pipe and a water storage tank. The shell is a cylindrical devacuumized shell. The water filling tank is a round shell with an opening along the shaft. The water filling tank and sleeve are sequentially arranged in the shell. An evaporation- condensation cavity (4) is formed by a space, which is not filled with water between water filling tank and sleeve or shell, and another water filling tank is installed in the last stage sleeve. The heating pipe is axially installed in the water filling tank. The connecting pipe is connected with each stage of water filling tank. The bottom of inner walls of shell and sleeve is connected with freshwater output pipe, which is connected to the water storage tank. The solar condenser is arranged below the shell. The light ray collector is arranged on the inner wall of last stage of water filling tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the multi-effect sleeve-type solar freshwater generator with light focusing function.    Solar condenser (1)    Shell (2)    Water filling groove (3)    Evaporation-condensation cavity (4)    Sleeve (5)