The invention belongs to the technical field of environmental protection and resource reutilization, and particularly discloses a dust recovery device. The device comprises a smoke dust pipeline, anda bag type dust remover is arranged at one end of the smoke dust pipeline; a pre-dust removal mechanism is further arranged on the smoke dust pipeline; the pre-dust removal mechanism comprises a plurality of louvers which are distributed in the axial direction of the smoke dust pipeline. Each louver comprises a plurality of perforated louver blades which are arranged in parallel, the perforated louver blades are obliquely arranged, and the perforated louver blades are distributed in the radial direction of the smoke dust pipeline; rotating shafts and high-pressure sprayers are arranged betweenthe adjacent louvers, the rotating shafts extend in the radial direction of the smoke dust pipeline, the rotating shafts are rotationally connected with the smoke dust pipeline, and the rotating shafts are coaxially and fixedly connected with cams; a driving mechanism is arranged outside the smoke dust pipeline, and the driving mechanism comprises a driving plate and a sheave; a spraying switch is fixedly connected to the outer wall of the smoke dust pipeline. By the adoption of the dust recovery device, the amount of gas dust in the bag type dust collector can be reduced, the dust removal period is prolonged, and then the service life of a filter bag of the bag type dust collector is prolonged.