The invention discloses a remote warning device for leakage current abnormities of a lightning arrester, which comprises a leakage current abnormity signal acquisition circuit, a signal judgment circuit, a communication circuit and a warning circuit, wherein the leakage current abnormity signal acquisition circuit is used for acquiring leakage current abnormity signals from a leakage current on-line monitoring circuit of the lightning arrester; the signal judgment circuit is used for calculating the abnormity signals acquired by the leakage current abnormity signal acquisition circuit, judging whether the leakage current abnormity signals exceed a fixed value instantaneously or for a long time, and transmitting judgment results to the communication circuit; the communication circuit is used for transmitting the judgment results of the leakage current abnormity signals of the lightning arrester output by the signal judgment circuit to a backstage computer of a transformer substation and a host computer of a centralized control center of the transformer substation; and the warning circuit is used for sending out warning signals under the control of the backstage computer of the transformer substation and the host computer of the centralized control center of the transformer substation. The remote warning device for leakage current abnormities of the lightning arrester is capable of conducting real-time monitoring for the operation process of the lightning arrester, reducing the labor intensity of workers, guaranteeing normal power supply for users, improving the reliability of power supply and reducing the damage rate of power supply devices.