It is the object of the invention to present a construction for convective smoke filtering cleaners, especially for of the kind that mainly consists of a ceramic smoke filter, a drive fan, a smoke converting device, a water filter, a poison filtering device and a draw fan. Its major feature is that the ceramic smoke filter percolates the black smoke in the exhaust duct and turns it into white smoke, and then the drive fan makes white smoke quickly flow into the smoke converting device. The water supply system of the smoke converting device keeps water flowing around the wall of the exhaust duct and atomized water spraying incessantly in the duct. A rotating reservoir atomizes water and sprays over the inside wall of the duct. Consequently, when the white smoke arrives at the smoke converting device, atomized water drops can completely absorb and purify the smoke. The drifting dust and impurities in smoke along with water fluid are collected in the water filter installed under the smoke converting device. Because that a poison filtering device is built behind the water filter and a drive fan on the top of the poison filtering device consecutively operates, the gas passing through the smoke converting device is totally sucked into the poison filtering device.