The multi-stage concrete gravel screening device comprises a
machine shell and further comprises a screening drum, driving assemblies are arranged on the peripheries of the outer walls of the front end and the rear end of the screening drum, and the screening drum is rotationally arranged in a cavity of the
machine shell through the driving assemblies; the gear bins are correspondingly arranged on the left side and the right side of the front end opening and the rear end opening of the
machine shell respectively, the gear bins are connected with a cavity of the machine shell in a communicating mode, and transmission gears in transmission connection with the driving
assembly are arranged in the gear bins. The cleaning bins are communicated and arranged on the two sides of the machine shell in an equal-length mode, cleaning mechanisms are arranged in the cleaning bins and comprise a plurality of sector plates which take the transmission shaft as the center and are arranged on the outer side of the transmission shaft in a circumferential mode,
brush heads are arranged at the outer side ends of the sector plates, and the
brush head ends are close to the screening drum in an attached mode; an opening is formed in the upper end of the feeding bin, one side of a bin body of the feeding bin is connected with one end of the machine shell in a communicating mode, a discharging opening is formed in the other end of the machine shell, and a conveying
auger transversely arranged at the central axis in the screening drum is erected from one end of the outer side of the feeding bin to one end of the discharging opening.