Abstract: The present invention provides a foldable mobile terminal, and a heat dissipation system and a housing of the foldable mobile terminal. The heat dissipation system includes a heat dissipation hole, a baffle, and a rotating shaft. The heat dissipation hole is defined on the housing of the foldable mobile terminal. When the foldable mobile terminal needs heat dissipation, the baffle rotates to open the heat dissipation hole for the heat dissipation. When the heat dissipation is not required, the baffle closes the heat dissipation hole to prevent foreign matters from entering an interior of the foldable mobile terminal through the heat dissipation hole and affecting performance of the foldable mobile terminal and causing failure.