The invention discloses a testing method for time accuracy by utilizing a system for testing remote communication traffic of substation measuring and control devices. The system is provided with a satellite timing service device for outputting time ticks to all automation equipment in a substation; the satellite timing service device is provided with multiple timing pulse units, and moreover, 1PPD idle contact signals are simultaneously output to the measuring and control devices in all the automation equipment; after pulses are received by remote communication units of the measuring and control devices, SOE (sequence of event) displacement information generated by the remote communication units of the measuring and control devices is transmitted to a substation computer monitoring system and is output to upper level automation systems outside the substation by telecontrol communication equipment. The testing method for the time accuracy by utilizing the system for testing the remote communication traffic of the substation measuring and control devices disclosed by the invention is simple to build, low in construction cost and convenient to extend, and can be used for carrying out scientific and effective timing automatic testing of remote communication traffic related technical indexes and functions on domestic and overseas measuring and control devices with different voltage classes in different manufacturers, the substation computer monitoring system and the upper level systems (centralized control station automation systems or power grid dispatching automation master station systems at different levels) of the substation computer monitoring system.