The utility model discloses a middle and low voltage relay protection automatic checkout system, test accurate source, the automatic switching control device of computer and human -computer interaction operation module including relay protection, the automatic switching control device of computer connects relay protection test accurate source, human -computer interaction operation module and the device that awaits measuring respectively. The utility model discloses after only needing to set up the apparatus information that awaits measuring, a key starts the automatic testing, starts back whole journey and need not artificial the participation and the operation, the test and the check -up that only need can finish in 4 minutes the middle and low voltage overload protection device of a complicacy. Easy operation is convenient nimble, the comprehensive detailed high efficiency of effect, the utility model discloses show information as a result among the automatic test procedure in real time, can be to quick, the comprehensive location of middle and low voltage overload protection device's problem to preserve the result, provide intelligent reliable comprehensive information for restoreing the solution trouble.