This mud scraper is suitable in gives in the dewatering excavation the water works or the Sewage treatment plant diameter is big (∮<15m) the spoke class type (circular) the sedimentation pond to blow the putty and to cast aside the dregs. It has the structure to be simple, consumes energy the province, the maintenance management to be convenient, the movement is steady, the job safety reliable, blows the collection sludge effect, to discharge the sludge moisture content low status merit well.