The health condition of solid rocket motors largely depends on the real-time status of the propellant. Therefore， monitoring the propellant status is an important foundation for ensuring the structural integrity and reliability of solid rocket motors. We provides a comprehensive review of research progress in the monitoring of propellant status from four aspects： environmental status monitoring， chemical status monitoring， mechanical status monitoring， and integrated application of monitoring data. The necessity of propellant status monitoring is highlighted， and the research achievements and shortcomings in propellant status monitoring are summarized from multiple perspectives. Furthermore， development ideas are proposed for monitoring technology and the application of monitoring data. The analysis suggests that real-time monitoring technology should focus on embedded sensor compatibility， new sensing technology， and long-life technology. In terms of the application of monitoring data， efforts should be made to establish databases， diagnostic and predictive health management systems， in order to promote the development of digital twin technology for the full life of solid rocket motors using finite element model updating methods.