The invention discloses a cooling tower and a control method thereof. The cooling tower comprises a tower body, a fan, a water distributing pipeline and a heating device, wherein the tower body is provided with an air inlet and an air outlet; the water distributing pipeline is mounted in the tower body and located between the air inlet and the air outlet; the fan is mounted in the tower body and located in the air outlet; the heating device is mounted in the tower body and located between the fan and the water distributing pipeline. Compared with the prior art, the cooling tower has the advantages that the heating device is additionally arranged at the specific position in the cooling tower, in the working process of the cooling tower, high-temperature air formed via heat exchange between the cooling tower and hot water sprayed by the water distributing pipeline rises, the relative humidity of the high-temperature air is reduced to become unsaturated moist air after the high-temperature is heated by the heating device, therefore, white smoke is effectively decreased.