The present invention provides a dehumidification apparatus and a power cabinet, and relates to the technical field of power equipment. The dehumidification apparatus includes a control module, and ahumidity sensor and a dehumidification system which are connected to the control module. The control module includes a data processor, a data receiving unit, a driving unit and a communication unit; the data processor is configured to receive a humidity parameter; when the humidity parameter exceeds a preset humidity threshold, the dehumidification system is driven by the driving unit to start dehumidification, and the communication unit is connected with the upper computer to send the humidity parameter to the upper computer and to receive a driving signal sent by the upper computer. The dehumidification system is driven by the driving unit to start the dehumidification work. The dehumidification apparatus and the power cabinet provided by the present invention help the staff to monitor the humidity of the environment in which the power cabinet is located in real time to take dehumidification work, so as to prevent the power equipment from being in a humid environment for a long timeand help to ensure the performance and the service life of the power equipment.