The invention relates to a greenhouse for drying salt and separating fresh water by solar energy. The traditional salt drying mode is natural evaporation by using a brine surface. In recent years, the salt drying method of gradually concentrating by an evaporation pond and a crystallizing pond is adopted to dry the salt, but the salt production cannot be well improved. The greenhouse comprises a greenhouse body (2) with a steel frame structure, wherein the upper part of the steel frame structure is connected with a water guide and delivery device (1); the lower part of the steel frame structure is connected with a heat pump dehumidifier (3); water pipeline systems are symmetrically and evenly distributed at the ceiling and tipsily arranged. The greenhouse is the greenhouse device used for improving the salt drying efficiency and obtaining fresh water by using solar energy.