The invention discloses a three-phase 
electric energy meter based on wide-area synchronous measurement. The three-phase 
electric energy meter comprises a central processor, a synchronous measurement 
electric energy metering module, a memory, a constant temperature 
crystal oscillator and a 
clock chip, and the synchronous measurement electric 
energy metering module, the memory, the constant temperature 
crystal oscillator and the 
clock chip are connected with the central processor; the central processor is used for externally being connected with a 
clock synchronization system, a second pulse of which is a benchmark, or an IEEE 1588 protocol clock 
system and for checking and keeping the time with the clock 
system, and the central processor is also used for sending an automatic synchronization sampling command to the synchronous measurement electric 
energy metering module and 
processing sampled data; the synchronous measurement electric 
energy metering module is used for metering electric energy and for synchronously collecting a plurality of continuous 
voltage current instantaneous data of each path in a whole net and storing the continuous 
voltage current instantaneous data; the memory is used for storing data processed by the central processor; the constant temperature 
crystal oscillator is used for cooperation with the central processor to carry out time keeping; and the clock 
chip is used for providing a work clock for the central processor. The invention further discloses a measurement method of the three-phase electric energy meter based on the wide-area synchronous measurement. Instantaneous values of electrical parameters can be synchronously measured, and requirements of the 
wide area measurement can be met.