The invention discloses an automatic shutdown safety protection device with safety slider wires for mobile devices, and comprises a slider wire conductor, a slider wire sheath, a collector, collectorcarbon brush sheets and a circuit breaker with separately-excitated slip, as well as an insulation isolator and a shorting switch; an insulation isolator with the same cross section shape as that of the slider wire conductor is arranged on at least one-phase slider wire conductor on a movement limiting position of a mobile device; the insulation isolator can insulate and divide the slider wire conductor into a limit position front part and a limit position rear part which are connected through the shorting switch; the limit position rear part is connected with the separately-excitated slip coil on the circuit breaker through the slip switch; the longitudinal length of the insulation isolator is smaller than that of the carbon brush sheet of the collector; the invention can effectively control stopping or running of the mobile device, avoid such life-and-death equipment failure accidents as traveling wheels off-road and etc, and eliminate safety hidden trouble and lower maintenance cost.