The utility model discloses a low pressure air-flow conveying device for slips which can make slice granules convey to the high and distant places with low pressure air-flow in the process of the industrial production. The utility model comprises a material feed hopper and a material discharge hopper 1, 4 and a rotary valve 2 with a rotary radial partition 3. When the material discharge hopper discharges the material, the continuous compressed air is insufflated by a laval nozzle 5, and then the continuous compressed air reaches a high position storage tank 5 by making use of the air-flow slice granule. The realization of the technique need the cooperation of the rotary speed of the radial partition, the amount of throwing the material, the inside diameter and length of the laval nozzle, and technological parameters. The utility model has the advantages of lower cost, simple structure, and easy use, and an automatic control system need not be mounted.