The utility model relates to an intelligent inspection system of a thermal power plant. The system comprises a wireless industrial Ethernet and an inspection data center and a multifunctional inspection terminal wirelessly connected with the wireless industrial Ethernet, wherein the inspection data center is connected with a DCS (Data Communication System) and an SIS (Safety Instrumented System) of a power station, has a synchronous clock period with the DCS and the SIS and can be used for inquiring, reading and writing data in a real-time and historical database of the DCS and the SIS of the power station; the inspection data center drives the multifunctional inspection terminal to sample data of an inspected target through the wireless industrial Ethernet and exchanges data with the multifunctional inspection terminal. The intelligent inspection system provided by the utility model carries out clock synchronization with the power plant DCS by adopting wireless communication, is capable of conveniently acquiring various diagnostic signals by virtue of the multifunctional inspection terminal and can integrate data with original DCS data to carry out trend analysis and evaluation on inspection data under similar working conditions so as to remind inspectors of mastering the operating states of equipment and parts and immediately maintaining the equipment and parts, thereby improving the equipment maintenance level and the security and stability of operation of the system.