Coupling treatment device applied to kiln tail white smoke and cooling tower white fog of cement plant and method thereof

The invention discloses a coupling treatment device applied to kiln tail white smoke and cooling tower white fog of a cement plant and a method thereof. The device comprises a ventilation cooling tower, a white fog collecting cover, an exhaust fan, a cooling water condenser and a chimney, wherein a smoke outlet of the white fog collecting cover at the top of the ventilation cooling tower is connected into a first kiln tail smoke channel G11 through a white fog collecting pipeline G2; the white fog collecting pipeline G2 is equipped with the exhaust fan; a smoke inlet of the cooling water condenser is connected with the first kiln tail smoke channel G11; a smoke outlet of the cooling water condenser is connected with a second kiln tail smoke channel G12 of the chimney; the second kiln tail smoke channel G12 and a kiln head smoke channel G5 are respectively connected with two sides of the bottom of the chimney; kiln head smoke enters the chimney through the kiln head smoke channel G5; kiln tail smoke enters the