The present invention relates to the technical field of rail vehicles, and particularly to a control method and device for a door auxiliary lock and a rail vehicle. The method includes: after the vehicle leaves the current
station, receiving a speed
signal, and when the speed
signal is at a high level and the door opening
side information of the next
station is received, controlling the door controller to stop outputting an electrical
signal to the
solenoid valve of the corresponding auxiliary lock, where the door opening
side information includes the target door opening side of the next
station; obtaining the door side where the passenger compartment of the vehicle where the door controller is located is located; and when the target door opening side is different from the door side where it is located, controlling the door controller to output an electrical signal to the
solenoid valve of the auxiliary lock corresponding to the door side where it is located. In the present invention, when the vehicle is about to enter the station, it is ensured that the auxiliary lock on the non-platform side is not unlocked, reducing the action
noise of the auxiliary lock and the unlocking times of the auxiliary lock, and improving the service life of the auxiliary lock.