For the first time, a national proficiency testing for data center power quality is organized. A verification plan is designed specifically for the operational characteristics of data centers, where all participating laboratories go to the designated micro-module data center for on-site testing. The three-phase standard source is used as the ideal physical sample, and the test parameters include voltage, current, power, frequency, and harmonics. The evaluation is conducted using the percentage relative difference D%. Analysis of the proficiency testing results indicates that there are three factors affecting the results of this verification: pre-experiment preparation, the quality of the testing personnel, and the accuracy of the measuring instruments.