The utility model discloses a portable CT polarity test work box, comprising a box body and a box cover, be provided with the sponge base in the box, be provided with the universal meter on the sponge base and accomodate chamber, switch and accomodate chamber, series connection dry battery and accomodate chamber, test wire and accomodate chamber and debris and accomodate the chamber, the switch accomodate in the chamber the switch with do A series of cells after be connected with the test wire respectively, the test wire is placed in the chamber is accomodate to the test wire, the universal meter pen -shape metre is placed in the chamber is accomodate to debris. The utility model discloses to test that required instrument is ingenious to be placed in sponge support, and jolt and can not collide each other on the way, the during operation will only need can the work of beginning CT polarity test with the correct connection of test wire.