Reaming tool special for valve seat of cylinder cover of multi-cylinder diesel engine

The invention discloses a reaming tool special for a valve seat of a cylinder cover of a multi-cylinder diesel engine, which adopts mechanically-clamped single-blade cutting to replace boring, so that high shape precision and position precision can be achieved, and the surface roughness value is greatly reduced. A blade is a metal ceramic blade, has very high hardness, wear resistance and red hardness, has good adhesion resistance, chemical stability and low friction coefficient, and can meet the surface quality requirement of a sealing ring belt. A guide pipe inner hole reamer adopts a push reaming mode, the straightness requirement and the surface roughness requirement of a guide pipe inner hole are met, and the coaxiality requirement of the sealing ring belt relative to the guide pipe inner hole is met. The tool solves the problems that the sealing ring belt has poor surface roughness, large shape error and large coaxiality error relative to the guide pipe inner hole, improves the percent of pass of the ma