The invention discloses a heat dissipation device and a control method thereof. The heat dissipation device including a driving module and a heat dissipation sheet is provided. The heat dissipation sheet has a connection portion and a swing portion and is connected to the driving module by the connection portion. When the driving module receives an input voltage to drive the connection portion, the connection portion drives the swing portion to swing back and forth so as to generate a heat dissipation airflow.