Dehumidification control method, controller and heat exchange system

The invention discloses a dehumidification control method, a controller and a heat exchange system. The method comprises the steps that the temperature of an indoor environment is obtained; based on the comparison result of the temperature and the preset target temperature, the heat source working state and/or the pipeline communication state of a heat exchange system used for exchanging heat with the indoor environment are/is controlled, and the temperature of the indoor environment meets the preset temperature condition; acquiring the humidity of the indoor environment; controlling a heat source working state and/or a pipeline communication state of a heat exchange system for exchanging heat with the indoor environment based on a comparison result of the humidity and a preset target humidity, so that the humidity of the indoor environment meets a preset humidity condition; the heat exchange system comprises a heat exchange device provided with a first heat exchange tail end and a second heat exchange tail e