The invention discloses a material absorber on a material dilute-phase conveying pipeline. The material absorber can dredge the pipeline and comprises a material bin, a rotary feeder and a conveying pipe, wherein a material inlet of the rotary feeder is communicated with the material bin, and a material outlet of the rotary feeder is connected with the conveying pipe and a straight air replenishing pipe through a tee joint; the air replenishing pipe is connected with a vertical air return pipe through a bent pipe and also connected with one end of a bypass pipe through a rear air replenishment adjusting valve; and the other end of the bypass pipe is connected with the air return pipe. Because the material absorber has a circular flow structure, the pipeline is convenient to dredge by opening the rear air replenishment adjusting valve so as to greatly reduce the maintenance cost of the pipeline.