The invention discloses a granite impact labyrinth desulphurization deduster. The lower end of an impact tube is provided with an impact chamber, the lower end at the right side of the impact chamber is provided with a water seal pool, the left end of the impact chamber is provided with a labyrinth chamber, a plurality of baffle plates are arranged in the labyrinth chamber, the upper end of the labyrinth chamber is provided with a fog removal plate, the rear end of the labyrinth chamber is tightly connected with the fog removal chamber, and a gas discharge tube is arranged at one side of the fog removal chamber. The deduster combining many dedusting methods has the advantages of effective improvement of the boilier dedusting desulphurization efficiency, reduction of the equipment investment cost, elimination of flue gas with water, simple and easily operated equipment, and reduction of the disposable investment and running cost and service duration of the equipment by adopting the granite material.