To provide a dust collector for grain drier, capable of being constituted so as to be simple and miniaturized even in the case of a wet type, reducing the consumption of water by circulating and using water reserved in a water tank, perfectly separating a dust collecting unit from the water tank, and easily effecting the removing and cleaning work of dust accumulated in the water tank.

The dust collector 1 for a grain drier is constituted of the water tank 2, whose upper surface is opened, and the dust collecting unit 3, disposed on the upper part of the water tank 2. The dust collecting unit 3 is constituted of a water splash producing unit 8 opposed to the opening end of an exhaust introducing tube 5 for downwardly introducing exhaust gas from the grain drier and a mixing unit 10 of the water splash into the exhaust gas, which is formed around the water splash producing unit 8. An exhaust gas passage 11 for the exhaust gas, whose dust is removed, is formed between the water tank 2 and the mixing unit 10 for the dust collecting unit 3. Water is reserved in the water tank 2 so as to retain a predetermined water level. Water is pumped to a fountain nozzle 7 at the central part of upper surface of a disc 6 for the water splash producing unit 8 by an underwater pump 12, arranged in the water tank 2.