Dehumidifier

The utility model discloses a dehumidifier. The dehumidifier comprises an aluminum shell, wherein a top cover is installed at the top end of the shell, and a bottom cover is installed at the bottom end of the shell. A fan is installed on one lateral side, located inside the shell, of the top cover. A power module is installed below the top cover. A refrigerating module is installed below the power module. A water groove is formed in one lateral side, located inside the shell, of the bottom cover. Air inside a machine is exhausted through the fan so as to generate negative pressure inside the machine, outward damp and hot air can be pumped into a cavity of the machine from the bottom cover, firstly passes through a cold end of a refrigerating sheet and cooled, moisture is coagulated and is exhausted through a water-collecting groove arranged on the bottom cover, and the damp and hot air becomes dry and cold air. The dry and cold air continues to go upwards, reaches to the power module, is heated by the power m