The invention relates to a dustless sieving and crushing integrated machine which comprises a machine frame and crushing cavities, wherein the crushing cavities consist of a primary crushing roller, an impact plate and a primary impact roller, a secondary crushing roller and sieving rollers, and a tertiary crushing roller and sieving rollers respectively; a rubber plate at the bottom of the dustless sieving and crushing integrated machine and a conveyor belt form a compact cavity body; a material inlet and an air draft opening are further formed in the top of the dustless sieving and crushing integrated machine respectively; an air draft dust removal device is arranged outside the air draft opening. The dustless sieving and crushing integrated machine is dustless sieving and crushing integrated mechanical equipment capable of realizing continuous crushing, continuous sieving and efficient crushing without dust.