Dry-wet combined composite closed cooling tower

The invention discloses a dry-wet combined composite closed cooling tower which comprises a cooling tower body, an upper air inlet shutter and a lower air inlet shutter which are arranged up and down are embedded in the side wall of the periphery of the cooling tower body, and the upper air inlet shutter is located on the outer wall of a dry air cooling tube bundle and a water collector clamping cavity. The lower air inlet shutter is positioned on the outer wall of a wet tube bundle and a water collecting disc clamping cavity, air outlet cylinders are mounted at the top of the cooling tower body, fans are mounted in the air outlet cylinders, first annular protrusions are arranged on the inner sides of the top ends of the air outlet cylinders, and lifting caps are mounted at the tops of the air outlet cylinders; and the bottom of the lifting cap is fixedly connected with a plurality of lifting supporting rods which are evenly distributed in the circumferential direction. Dust impurities in air can be effective