The invention relates to a coal mine safety dynamic appraisement and diagnosis system and belongs to the technical field of mine safety. According to the technical scheme of the invention, the system comprises a server, an operation terminal, network switching equipment and underground monitoring equipment. The server and the operation terminal, positioned above a well, are connected with the underground monitoring equipment via connection equipment. The underground monitoring equipment serves as a detection device for detecting the pressure and fireproof gas data of an underground top plate. Data acquired by the underground monitoring equipment are transmitted to the server and the operation terminal via the network switching equipment. After the information processing step, a result is displayed on the operation terminal. According to the technical scheme of the invention, a coal mine information system and a monitoring and supervision system, which are comprehensively integrated, are adopted as a basis for the establishment of a coal mine safety integrated database and an expert knowledge base. In combination with coal mine daily transactional data and real-time monitoring data, the coal mine safety dynamic appraisement and diagnosis system is established based on a three-dimensional virtual mine model. Finally, the occurrence of coal mine safety production incidents is reduced. Meanwhile, the informatization and the modernization of the coal mine safety management are realized.