The invention relates to a deep dehumidification, dust-removing and purification device. The deep dehumidification, dust-removing and purification device comprises a sound blasting device and a purification container, wherein the purification container is provided with a gas inlet and a gas outlet; gas passing through the gas inlet is mixed with a liquid medium which is blast into mist by the sound blasting device, and then the mixture enters the purification container; the purification container is internally provided with a filtering device which is available for the gas in the purification container to pass and capable of carrying out dust removal and filtering on the passing gas and a liquid distribution device which is used for distributing a treating solution on the filtering device; the treating solution is distributed on the filtering device in a liquid film form through the liquid distribution device, so that the gas can penetrate through; and the purification container is internally provided with a capturing device for capturing aerosol of the gas passing through the filtering device. With the adoption of the deep dehumidification, dust-removing and purification device, flue gas and water are sufficiently mixed through the sound blasting device and dust particles in the flue gas are removed, so that the dust content in the exhausted gas is less than or equal to 5mg/m<3>; and by matching the filtering device with the capturing device, the aerosol in the flue gas is completely captured, and harms to atmosphere and human health, caused by the fact that the exhausted gas contains the aerosol, are avoided.