The utility model relates to a mutual -inductor inserts formula three -phase electric energy meter verification assembly line epitope contact nature instrumentation, technical scheme be, which comprises a housin, be provided with the display on the casing, the casing side is provided with the corresponding first measuring punch combination of A looks current -voltage inspection hole that inserts formula three -phase electric energy meter with the mutual -inductor respectively, the corresponding second of B looks current -voltage inspection hole that inserts formula three -phase electric energymeter with the mutual -inductor detects the punch combination, the corresponding third of C looks current -voltage inspection hole that inserts formula three -phase electric energy meter with the mutual -inductor detects the punch combination and detects the punch combination with the corresponding fourth of N looks current -voltage inspection hole that the mutual -inductor inserted formula three-phase electric energy meter, this greatly makes things convenient for the utilities electric co. Regularly to detect each mutual -inductor access formula three -phase of electric energy meter assembly line electric energy meter verification assembly line epitope pin contact reliability, guaranteed that the mutual -inductor inserts the reliability of the working property of formula three -phase electric energy meter assembly line, high durability and convenient use, good effects, there are good society and economic benefits.