The invention discloses a compound force field dry sorting machine. The machine comprises a bottom support used for supporting and adjusting the height of a sorting bed body and an air supply device,and the sorting bed body is installed on the bottom support through a damping device; to-be-sorted materials are fed into a sorting bed through a feeding device, air is fed through an air feeding device and sorting bed surface holes and acts on the to-be-sorted materials, a vibration excitation device generates excitation force to act on the sorting bed body to drive the sorting bed surface to acton the to-be-sorted materials, the to-be-sorted materials are sorted under the action of a compound force field formed by the wind power, excitation force, gravity and bed surface friction force, light-density materials are discharged by spirally overturning and crossing a sorting bed baffle under the action of a sorting bed turning plate through a light-density material device, and high-densitymaterials continue to move along the bed surface till the high-density materials cross the sorting bed baffle to be discharged by a high-density material device. The compound force field dry sorting machine is compact in structure, stable in operation, high in reliability, uniform in feeding, good in sorting effect, energy-saving, environmentally friendly and the like, and has wide adaptability.