The utility model discloses a current-transformer secondary testing device, and the device comprises a plurality of wire clamps which are respectively used for clamping all terminals of a current transformer. Each wire clamp is welded with one end of a wire and being packaged in a plastic package manner. The other ends of a plurality of wire are connected with each other. The utility model also discloses a combination of the device. The joints of a plurality of test wires of the device are connected with each other. The utility model has the following beneficial effects: only three terminals of a to-be-tested winding need to be left during testing, and the wire clamps sequentially clamps the other terminals of the current transformer, and then the testing can be carried out; only the three wire clamps on three terminals of another to-be-tested winding need to be unload, and then respectively clamp three terminals of a former tested winding when a to-be-tested winding needs to be changed, and then the testing can be carried out; the operation is simple and convenient; and the device is time-saving and labor-saving.