Automatic isolation toilet door

In order to solve the problem that a door cannot be locked when a railway vehicle bathroom breaks down, the utility model provides an automatic isolation bathroom door which comprises a door plate, a door lock, a lock stopper, a fault locking mechanism, a PLC (Programmable Logic Controller), a fault sensor and a position sensor, the stopper is arranged at the locking position of a spring bolt A of the door lock, and a position sensor is arranged on the stopper; a fault sensor is arranged in the toilet; the fault locking mechanism comprises a mounting frame, a motor, a bevel gear, a transmission lead screw, a transmission nut, a transition plate and a spring bolt B; the motor is fixedly connected with the mounting frame; two shaft holes of the bevel gear are vertical, and one shaft hole is fixedly connected with a motor rotating shaft; the other shaft hole is fixedly connected with the transmission lead screw; a transmission nut is arranged on the transmission lead screw; a transition plate is arranged at the