Rescuing and returning apparatus for motor train unit

The invention provides a rescuing and returning apparatus for a motor train unit. The motor train unit is in a rescuing and returning state. The rescuing and returning apparatus comprises a storage battery, a precharging circuit, a three-phase inverter, an auxiliary inverter and an alternating current asynchronous motor. The precharging circuit comprises a DC-DC converter which is used for providing a first direct current voltage to the storage battery so as to allow the voltage of a busbar to reach a second direct current voltage; the three-phase inverter is used for converting the second direct current voltage into alternating current so as to premagnetize the alternating current asynchronous motor and to allow the alternating current asynchronous motor to enter a fourth quadrant for working; after the alternating current asynchronous motor enters the fourth quadrant for working, alternating current is output according to mechanical energy produced by dragging of the motor train unit and the voltage of the