The utility model discloses a plunger pump valve seat, and belongs to the technical field of plunger type high-pressure water injection pumps. The plunger pump valve seat comprises at least one liquid absorption hole and at least one liquid drainage hole which are formed in a valve body. A liquid absorption hole diversion trench is formed in the liquid outlet end face, corresponding to the liquid absorption holes, on the valve body. A liquid drainage hole diversion trench is formed in the liquid outlet end face, corresponding to the liquid drainage holes, on the valve body. The plunger pump valve seat overcomes the defects that an existing valve seat and an existing valve plate are short in service life and poor in correspondence.