Abstract: Outdoor loop network cabinets are subject to varying environmental conditions, and internal temperature and humidity control is particularly important. However, traditional loop network cabinets often experience condensation phenomenon, resulting in frequent equipment failures. To address this issue, we developed a hybrid dehumidification device for outdoor loop network cabinets. The device consists of passive ventilation and active ventilation components, which can effectively regulate the temperature and humidity inside the loop network cabinet. After being put into use, the dehumidification effect is significant, effectively alleviating the condensation inside the loop network cabinet and reducing the equipment failure rate. This article details the design, working principle, and practical application of the device, providing useful references for research and applications in related fields.