The invention discloses a wet-type dense grid filter purifier which comprises a box, a dense grid plate, an atomizing spray head, a flow meter, a liquid supply pump, a liquid collection box and a liquid removal device. A filtering unit adopts the dense grid plate on which fibers are vertically and densely arranged and which has certain thickness, and a spray washing effect of the atomizing spray head is utilized for improving the filtering efficiency and air treatment capacity and blocking the blockage of the filtering unit. The liquid collection box on the lower part of the box of the wet-type dense grid filter purifier comprises a sealing plate, a reflux inlet, a liquid injection port, a dredging opening and a filtering net, aerosol particle-containing turbid cleaning liquor flowing from the cleaned dense grid plate and dropping from the liquid removal device can flow back into the liquid collection box through a discharge opening and is recycled after precipitation and filtration, and the operations of dredging and replacing the cleaning liquor can be periodically performed according to the deposition conditions at the bottom of the liquid collection box. Moreover, the wet-type dense grid filter purifier can adopt cleaning solutions of different properties according to the properties of aerosol particles to be purified, and the wet filtering purification aim is achieved.