The invention discloses an uneven falling film tube applied to falling film dust removal, an uneven falling film unit and an uneven falling film device. The falling film tube comprises a circular tubebody and a flow limiting groove located in the circular tube body; and a radial distance from the lowest point of the bottom surface of the flow limiting groove to the round edge line of the cross section is 0.3-5.9 mm, and a radial distance from the highest point of the bottom surface of the flow limiting groove to the round edge line of the cross section is 0.1-1 mm, and the grooving angle of the flow limiting groove is 30-210 DEG. The unit comprises distribution plates and the uneven falling film tube; and the distribution plates comprise a top distribution plate and a bottom distributionplate. The device comprises the unit and a flow guide channel; a plurality of the units are communicated in a crossed manner through the flow guide channel; the bottom distribution plate comprises a second through hole; and the center of the second through hole is located in the geometric center of a triangle formed by adjacent first through holes. The water consumption is effectively reduced, sothat the energy consumption for circularly conveying water is reduced; the arrangement of the flow limiting groove avoids the arrangement of excessive liquid films; and a stable liquid film is formedunder the constraint of the flow limiting groove, so that a high gas speed can be borne, and the entrainment phenomenon is not prone to occurring.