Valve retainer sealing face width testing tool

The invention discloses a valve retainer sealing face width testing tool. The testing tool comprises a testing tool body, a first detection block and a second detection block, wherein a first groove runs through the perpendicular direction; the first detection block is elastically contained inside the first groove in a reciprocating lifting mode, the outer wall face of the first detection block isin tight fit with the inner wall face of the first groove, a second groove runs through the first detection block, and the axis of the second groove coincides with the axis of the first groove; the second detection block is elastically contained inside the second groove in a reciprocating lifting mode, the outer wall face of the second detection block is in tight fit with the inner wall face of the second groove; the bottoms of the testing tool body, the first detection block and the second detection block jointly form a measuring face, and the measuring face is attached to the inner surfaceof a valve retainer to be