The utility model discloses a current transformer CT polarity test device, this CT polarity test device includes: anodal flexible reference test bar, the flexible reference test bar of negative pole and polarity test appearance, the hook -like measuring head of anodal flexible reference test bar is used for articulating the inlet wire end that once inclines at CT, and the hook -like measuring head of the flexible reference test bar of negative pole is used for articulating the leading -out terminal that once inclines at CT, the polarity test appearance includes: CT once incline test module, table meter test module, test switch and power module, test switch is used for controlling power module and switches on when opening, and the power module that switches on once inclines test module through CT and once inclines for CT and apply the pointer ampere meter test module 0 that the electric current showed to count test module for simultaneously table meter test module power supply messenger, judges CT polarity according to the test module 0 direction. The utility model discloses the CT polarity test device has simply, safety, accuracy and efficient advantage, has reduced on -the -spot human cost and test time, makes the more smooth and reliable and simple of whole test procedure.