Cable insulation testing device with status self-check of digital output relay

The utility model discloses a cable insulation test device of state self-test for open relays, which comprises an open circuit which is arranged on an open board and combined units of the relay, the open circuit is composed of multi-group of triodes (Q 1,Q 2...Q n), the combined units of the relay are composed of relay coils (J1,J 2...J n) which are respectively in series connection with collecting electrodes of the triodes (Q 1,Q 2...Q n) of the open circuit, a moving contact or a back contact of disconnected contacts controlled by each relay coils (J1,J 2...J n) are electrically connected with the input end of a self-test circuit arranged on the open board, and the moving contact or the back contact are respectively electrically connected with a power (JZ24), the self-test circuit is composed of multi-group of photoelectric couplers (U 1,U2...U n). The utility model has the advantage of achieving monitoring of testing the state of the relay.