The utility model discloses an online check -up terminal box of power meter, online check -up terminal box of power meter is connected with power meter and standard table electricity respectively, including the base, standard table current test return circuit interface group, standard table voltage test return circuit interface group, current loop binding post row on the base is located to the right side in proper order in a left side, pressure circuit binding post arranges and the power meter withdraws from return circuit interface group, still switches the clamp plate and shows voltage test return circuit interface group with the standard located and locate the little switch F of air including locating a plurality of that standard table current test return circuit department of interface group and power meter withdrawed from department of return circuit interface group. The utility model has the characteristics of can make the not short circuit of voltage transformer secondary side when access of reference power table or power meter change, the current transformer secondary side is not opened a way, and the reconfiguration line is simple and convenient, is applicable to the standardized check -up work of power meter.