Business board structure and distributed network device

The present invention provides a business board structure and a distributed network device. The business board structure comprises a frame structure, a main board fixed to the frame structure, a side panel fixed to one end of the frame structure, and fan groups which are assembled on the side panel and enable heat dissipation for a power device on the main board; the business board structure further comprises air inlets formed in the main board, a cover plate which covers one side surface of the main board, an air blocking plate which is arranged between the cover plate and the main board and blocks airflow between the fans and the air inlets, and a ventilation hole formed in the air blocking plate, wherein the one side surface of the main board is provided with the power device; and a radiator and/or the large power device on the main board is located on an airflow path between the air inlets and the ventilation hole. According to the business board structure and the distributed network device of the invention, the structure of an air channel in the business board is changed, so that the airflow in the business board can pass through the radiator and/or the large power device, and therefore, heat dissipation can be carried out on the business board effectively, and the reliability of the distributed network device can be improved.