The invention discloses a test system and method for the alternating effect of an alternating current loop. The test system comprises the alternating current loop, an alternating induction device coupled with the alternating current loop, a first ammeter coupled with the alternating current loop, a second ammeter coupled with the alternating induction device and an MCU connected with the first ammeter and the second ammeter; the alternating current loop is used for providing loop current; the alternating induction device is used for conducting electromagnetic induction with the alternating current loop to generate induction current; the first ammeter is used for detecting the loop current; the second ammeter is used for detecting the induction current; the MCU is used for storing and establishing a corresponding relationship of the loop current, the induction current and a preset number of coil turns of the alternating induction device. According to the test system and method for the alternating effect of the alternating current loop, the induction current is detected by the alternating induction device coupled with the alternating current loop in cooperation with the ammeters without human participation, the processing efficiency and accuracy can be effectively improved, and the labor cost is effectively reduced.