The utility model discloses a dehumidifying device of a variable pitch system. The dehumidifying device comprises an absorption core, wherein the absorption core is provided with a core air inlet and a core air outlet, an absorption body is arranged inside the absorption core, the absorption body is arranged between the core air inlet and the core air outlet, and a circulating fan is arranged between the core air inlet and the absorption body. No liquid water is generated in a drying process; moreover, the dehumidifying device is free from the maintenance after working for long time; a dehumidifying effect can be achieved for a long time under the situation with no external power supply; no directional limit exists in an installation and application process; and no additional temperature rise is brought to an internal environment of a cabinet body.