The invention discloses a polarity test circuit for a current transformer. The test circuit comprises a pressurized excitation module, a voltage sampling module, a main control module and a display module, wherein a pressurized control signal is outputted by the main control module to the pressurized excitation module, an excitation voltage is outputted by the pressurized excitation module according to the pressurized control signal to a primary side of a current transformer, after the excitation voltage is received by the current transformer, an induction voltage is outputted by a secondary side to the voltage sampling module, the induction voltage is received by the voltage sampling module and is converted into a voltage sampling signal, the voltage sampling signal is sent to the main control module, polarity of the current transformer is determined by the main control module according to the voltage sampling signal, and a display signal containing the polarity information is outputted to the display module. The test circuit is advantaged in that polarity detection of the current transformer is accurate, sensitivity is high, manpower and material resources can be greatly saved, work efficiency is improved, and relatively good engineering application prospects are realized.