The invention discloses a multi-stage mineral crushing mechanism. The multi-stage mineral crushing mechanism comprises a base, a rack, a driving motor, belts, belt wheels, a
moving jaw, a fixed jaw, a connecting rod, roller groups and a gear, wherein the rack is arranged on the base; the
moving jaw is installed on the base, and is hinged with the base; one end of the connecting rod is connected with the belt wheels, and one end of the connecting rod is connected with the
moving jaw; the roller groups are two, and are connected and driven by the gear; rollers are installed on the rack; the driving motor is installed on the rack. The combined mode of a jaw-type crushing mechanism and a roller
grinding mechanism is adopted for the multi-stage mineral crushing mechanism provided by the invention, can be used for greatly shortening the crushing time of minerals and improve the
grinding precision, and improves the
grinding efficiency greatly; moreover, non-cylindrical design is adopted for the rollers of the roller grinding mechanism, convex and concave arc surfaces are matched in rolling, and the
creative design increases the meshed angle between
mineral particles and the rollers, so that a crack crushing effect is provided in the extruding and crushing process, and a mechanism with higher productivity is formed.