The technical scheme of the invention comprises a game performance monitoring method and system, which is used for realizing: a Hook technology is used for injecting a monitoring program into a graphic driving interface, analyzing important performance indexes of a game, recording the important performance indexes into a file, and displaying daily performance data of the game in a web graphic form, and if performance comparison is abnormal, for example, the average FPS difference is 10%, performing notification warning in a mail form. The invention has the beneficial effects that it is independent of a specific project and a project development or operation maintenance stage, and when the performance of the game client is abnormal, a developer is automatically notified and important performance data indexes are provided for the developer for troubleshooting. Different game development teams do not need to develop and maintain client performance data statistics, collection, output, analysis and the like respectively; developers can quickly perform targeted problem analysis and optimization; game quality is guaranteed, and players can experience smoother and more vivid games with movie-level image quality.