The invention relates to a radar monitoring method and device for the long-term security risk of chemical equipment. The method comprises that real-time operation state data of the chemical equipment is obtained, the risk and operability of each system of the chemical equipment are analyzed, technical deviation is determined, and data to be monitored is screened from the real time state data; fault identification is carried out on the data to be monitored to obtain alarming information; and fault diagnosis and tracing are carried out on the alarming information to obtain the reason and corresponding remedial measures of the fault.