The invention discloses a main bearing valve seat integrated gauge. The main bearing valve seat integrated gauge includes an exhaust hole positioning pin, a valve seat measuring block and a rivet positioning hole pin; the left end of the valve seat measuring block is provided with a first positioning block; the right end of the valve seat measuring block is provided with a second positioning block; a first positioning hole is formed at the center of the first positioning block; a second positioning hole is formed at the center of the second positioning block; the exhaust hole positioning pin is installed in the first positioning hole; and the rivet positioning hole pin is installed in the second positioning hole. The main bearing valve seat integrated gauge has the advantages of simple and reasonable structure and quick and convenient use. According to the main bearing valve seat integrated gauge, through the cooperative use of the valve seat measuring block, the exhaust hole positioning pin and the rivet positioning hole pin, the reasonability of the detection of the positions of an exhaust hole and a rivet hole can be facilitated. The main bearing valve seat integrated gauge is convenient to use. With the main bearing valve seat integrated gauge adopted, the detection of the size of the exhaust hole can be facilitated; the detection of the size of the rivet hole can be facilitated; the detection accuracy of a main bearing valve seat can be improved; and detection efficiency can be accelerated.