The utility model provides a pneumatic conveying device for drill cuttings and belongs to the technical field of pneumatic conveying. The pneumatic conveying device comprises an air supply device, a spiral feeding device and a sending device, wherein the spiral feeding device comprises a horizontally arranged spiral conveyor; a feed valve is arranged above the feed opening of the spiral conveyor; and a receiving hopper is arranged above the feed valve. The pneumatic conveying device is characterized in that the sending device comprises a sending tank body that is arranged between the feed opening of the spiral conveyor and the feed valve; the outlet of the spiral conveyor is connected with a main nozzle; an auxiliary nozzle is arranged on the outside of the main nozzle; and a discharge valve is arranged between the main nozzle and the auxiliary nozzle. The pneumatic conveying device has a low conveying speed, small abrasion and low energy consumption through the adoption of a concentrated phase pulse pneumatic conveying method, has a compact structure and convenience in mounting and conveying through the adoption of a spiral shaft pushing and pneumatic pulse sending mode, is applied to a marine oil drilling platform to serve as an important element of a drill cuttings conveying system, and plays an important role in reducing marine environment pollution.