A cooling apparatus is for dissipating heat from an electronic device. The cooling apparatus includes a casing, an impeller, and a motor. The casing is for absorbing the heat and allowing coolant to flow therein. The impeller is received in the casing. The motor is received in the casing, and is for providing a force to drive the impeller to rotate to force the coolant to flow. The coolant flows between the casing and the motor to take the heat away.