Polarity tester of current transformers of transformer

The utility model provides a polarity tester of current transformers of a transformer. The polarity tester includes a casing and a control circuit board arranged in the casing. A current acquisition joint used for acquiring differential current of current transformers at the low-voltage side, the intermediate-voltage side and the high-voltage side of the transformer is arranged on the casing. A control chip and a power module, a storage module and a display output module which are respectively connected with the control chip are arranged on the control circuit board. The current acquisition joint is electrically connected to the control chip and the storage module. The polarity tester of the current transformers of the transformer shortens the detection time and improves detection efficiency and detection accuracy so that timely finding of potential safety hazards of the transformer is facilitated and normal operation of a whole electrical device is ensured.