The invention discloses an electronic apparatus and a fan module thereof. The fan module includes a base, an impeller, a liquid container, an atomizing device and a cover. The impeller is provided in the base. The liquid container is placed at the center of the impeller, and the liquid container contains a liquid. The atomizing device is disposed on the liquid container, and the atomizing device can atomize the liquid to form a mist to spray in order to absorb the heat in the electronic apparatus. The cover covers the base and forms an air outlet with the base. Furthermore, the cover has an air inlet. When the impeller rotates, the blade of the impeller drives airflow mixed the heated mist to enter into the base through the air inlet of the cover, and to exit from the base through the air outlet.