The present invention discloses a network device, including a shelf in which a first accommodation area, a second accommodation area, a first channel, and a second channel are disposed. The first channel and the second channel are located on two sides of the second accommodation area separately. A front board module and a rear board module are disposed at the first and second accommodation areas respectively. A third channel is formed between adjacent rear board modules or between the rear board module and the shelf. A first fan and a second fan are both disposed at a rear end of the shelf, the first fan faces the third channel, and the second fan faces the second channel. An airflow sequentially passes, from a front end of the shelf, through the front board module in the first accommodation area, the third channel, and the first fan to form a first heat dissipation channel, an airflow sequentially passes through the inside of the rear board module, the second channel, and the second fan after entering the first channel from the outside of the shelf, to form a second heat dissipation channel, and the first heat dissipation channel and the second heat dissipation channel are independent of each other. A heat dissipation air duct of the network device in the present invention is simple, which improves utilization of a fan, and enhances a heat dissipation capability.