The utility model discloses a novel melon seed specific gravity separator, it includes frame and sifting bed, the frame top is equipped with the sifting bed, be equipped with the transmission shaft that driving motor and level set up in the frame, driving motor with the transmission shaft passes through belt transmission and connects, the both ends of transmission shaft are passed respectively frame length direction's both ends lateral wall, and place in the lateral wall outside of frame, be equipped with the eccentric balance weight axle on the transmission shaft. The advantage lies in: the eccentric balance weight axle makes the transmission shaft reduce in the vibration that produces the frame of during operation, makes the frame can place the subaerial use in what in office, and save warpout rest base portion and build concrete foundation, reduce cost, the specific gravity separator can move wantonly, improves the convenience of using.