The invention discloses a mechanical sealing end surface deformation measurement system based on binocular vision DIC and a measurement method thereof. The system comprises a mechanical sealing test device, high-speed digital cameras, lenses, acquisition cards, a light source, a calibration plate, a support system, and a server for digital image acquisition and correlation analysis and processing. The measurement method altogether comprises eight steps. A speckle image on the surface of a mechanical sealing static ring in an operation condition can be acquired, the image can be analyzed and processed by directly using the binocular vision digital image correlation method, and thus, a three-dimensional shape on the surface of the mechanical sealing static ring, and a three-dimensional deformation field under effects of force and thermal load can be acquired. According to the method, the use is convenient, the measurement precision is high, the full-filed measurement problem of surface deformation under effects of force and thermal load of mechanical sealing can be effectively solve4d, and foundation is laid for making a research on key factors influencing mechanical sealing deformation and exploring measures for reducing deformation.