A dust treatment device used in ore processing comprises an air suction device, a pipeline device, a first filtering device, a second filtering device, a connecting device and a purifying device. The air suction device comprises a first frame, a first pipeline, an air incoming hopper, a first support, a second pipeline, a first roller, a first filtering net, a second support, a second filtering net and a third pipeline, the pipeline device comprises a fourth pipeline, a third support, a second fan, a first cross rod, a first inclined rod, a first bent rod and a fourth support, the first filtering device comprises a second frame, a third filtering net, a fourth filtering net, a first spring and a first cushion block, the second filtering device comprises a third frame and a first retaining plate, the connecting device comprises a fifth pipeline, a seventh support, an eighth support, a ninth support, a tenth support, a six pipeline and an eleventh support, and the purifying device comprises a purifying box, a sixth filtering net and a fourth frame. The dust treatment device can suck dust in for thorough purifying and filtering and has remarkable purifying effect.