The invention discloses a remote comprehensive online monitoring method for electric power automation devices. By means of the method, online real-time monitoring of the automation devices is achieved, and various power grid losses caused by machine halt of the automation devices are avoided. The method is characterized in that the automation devices in a transformer substation are connected to a data network access device of the transformer substation, wherein the automation devices comprise the RTU device, the integrated automation general control machine, the electric quality acquisition device and the secondary safety protection equipment; the data network access device in the transformer substation is connected with backbone data network device nodes and finally imported to a core data network device node, namely a dispatching automation master station; all the accessed device are named and numbered through the dispatching automation master station to form a network topology; heartbeat messages are sent out by a data collection and analysis server to get in touch with all the devices so as to judge whether the devices are online or crash; the judged results are stored in a history data server database and operating staff are informed through an alarm server in the modes of voice alarm and mobile phone short message alarm.