The invention discloses a chute type concentrator. The chute type concentrator comprises a frame; the frame is fixedly provided with a motor and a reducer, the motor drives the reducer through a hydraulic coupler, and the reducer drives two screw shafts mounted inside a chute body to rotate through a reversing synchronous gear pair; each screw shaft is fixedly provided with helical blades, the lower end of each screw shaft extends out of the chute body, and the extending portion is provided with a water seal type bearing in a sleeve mode; each water seal type bearing and a corresponding bearing at the upper end of the corresponding screw shaft are both fixed onto the frame through bearing seats. The chute type concentrator overcomes the defect that the lower bearing of an existing screw shaft is arranged on the end surface of a poor-rigidity welding chute body and cannot guarantee the coaxiality, reduces the equipment failure possibility and prolongs the service life.