The invention discloses a braking control device used in a vehicle braking machine, and a method and a multi-machine vehicle braking control system which are used in the braking control device. The braking control device comprises a single braking controller which is provided with a plurality of working stations and a microprocessor braking control unit, when the single braking controller is located in one of the plurality of working stations, the single braking controller outputs electrical signals corresponding to the working station where the single braking controller is located, and the microprocessor braking control unit is connected with the single braking controller, is used for receiving the electrical signals, and confirms the working station where the single braking controller is located according to the electrical signals. According to the braking control device, the single braking controller is used for replacing an electrical vacancy station of an original air braking valve, the working station where the single braking controller is located can be accurately monitored, and therefore a working state of a slave control vehicle can be intellectually controlled according to a working state of a master control vehicle, and safety performance is improved.