The invention discloses an overweight dry separator comprising a centrifugal separation cavity, wherein mineral material discharging holes are formed in two ends of the centrifugal separation cavity, and a mineral material feeding hole is formed in the top of the centrifugal separation cavity; the centrifugal separation cavity is arranged on a rotating mechanism driving the centrifugal separation cavity to centrifugally rotate; the mineral material discharging holes formed in two ends of the centrifugal separation cavity are not located on the same horizontal line; and the outer part of the centrifugal separation cavity is provided with an air flow generating device used for supplying an air flow acting force from one of the mineral material discharging holes to the other mineral material discharging hole in the body of the centrifugal separation cavity. High-density and low-density mineral materials are separated according to the principle that materials with the same particle size grade have different centrifugal forces because of different densities and move in different directions because of different directions of resultant forces of the centrifugal forces and the air flow acting force in air flows with the same speed; and the overweight dry separator has the advantages of simple separation process, good separation effect, high precision, low production cost, equipment miniaturization and extremely low energy consumption.