The invention discloses a lightning arrester DC leakage test device and relates to the technical field of power systems. The main purpose of the lightning arrester DC leakage test device is to make the operation of a lightning arrester DC leakage test simple and convenient and to improve work efficiency. The lightning arrester DC leakage test device is characterized by comprising a high-voltage generator equipped with a test core wire, and a shielding cover made of an insulating material, wherein the inner wall of the shielding cover is provided with a first conductive layer connected with the test core wire, the shielding cover covers the outside of the flange of the lightning arrester, and the first conductive layer is used to be connected with the flange. The lightning arrester DC leakage test device is mainly used for DC leakage tests on lightning arresters.