Power frequency AC voltage-withstanding test device

The utility model discloses a power frequency AC voltage-withstanding test device, which comprises a voltage regulator TR connected with an AC power supply U. Two end heads where the voltage regulator TR is connected with the AC power supply U are respectively serially connected with a control switch K; an ammeter A is serially connected onto the wire connected with a tap of the voltage regulator TR; the output end of the ammeter A is serially connected with a test transformer TT; two ends of the primary side of the test transformer TT are parallelly connected with a voltmeter V; one end of the secondary side of the test transformer TT is grounded; the secondary side of the test transformer TT is connected with a tested sample CX; two ends of the tested sample CX are parallelly connected with a voltage divider F; and a protection resistor R and a reactive power compensation device are sequentially serially connected between the test transformer TT and the tested sample CX. As the reactive power compensation device is added, capacitive reactive power of the tested sample is compensated, reactive power of the test system is reduced, and the apparent power, the capacity, the size and the weight of the test transformer are reduced, and the test efficiency is improved.