Workpiece cleaning wastewater treatment system

The invention discloses a workpiece cleaning wastewater treatment system which comprises a drainage channel and a water collecting tank which are arranged on a foundation, drainage nets are laid on the drainage channel and the water collecting tank, an oil-water separator is erected on the foundation and used for treating wastewater, and a filtering assembly is installed in the water collecting tank and comprises a main box body and an auxiliary box body. A residue filtering assembly is installed in the main box body and comprises a filtering belt and four belt guide rollers, two water retaining rings are arranged on the inner ring wall of the filtering belt, a plurality of partition pieces are arranged on the filtering belt, each belt guide roller comprises a rotating shaft and a synchronous wheel, the rotating shafts are installed on the main box body, a residue discharging opening is formed in the main box body, and a residue discharging flow channel is installed in the residue discharging opening of the m