The invention discloses a breaker trip opening fault removal device in a station power supply AC-DC loss state. The device comprises a primary circuit part, a sampling loop and an execution loop, wherein the primary circuit part is an electrical separation formed by connecting a bus bar, a bus side isolation switch, a circuit breaker, a current transformer and a main transformer or a wire outlet side isolation switch in series; the sampling loop comprises a current sampling loop of a current transformer and a mechanism box DC bus voltage sampling loop; and the execution loop comprises an overcurrent current relay action execution loop, a mechanical time delay action execution loop and a low voltage relay action execution loop. According to the device, a circuit is simple and reliable, after the fault current appears, the fault current is removed within a specified time through the breaker trip-free opening device under a condition of station power supply AC-DC loss, so that the influence of the fault current on a master device of a transformer substation is reduced.