The application of the invention discloses a valve seat height difference measurement device. The valve seat height difference measurement device comprises a dial indicator, a fixing block, and an abutting block, wherein the dial indicator comprises a dial plate, a sleeve connected with the dial plate, and a measuring rod located in the sleeve and connected with the dial plate; the measuring rod moves in the sleeve in a reciprocating manner; the fixing block is installed in the sleeve; the abutting block is arranged on the fixing block and faces the measuring rod. The abutting block is used to help the dial indicator to measure the tiny height difference, the valve seat height difference measurement device is convenient to use, moreover, the abutting block is provided with a blade part and a second abutting part, is suitable for adjusting and measuring different depth and height differences, is convenient in fine adjustment, and is convenient to use.