The invention relates to a technical scheme for vehicle oil supply travelling and braking, in particular to an accelerator and brake integrated device. The accelerator and brake integrated device comprises a pedal and a pedal rod connected with the pedal. The pedal rod is connected with the extended end of a piston rod of a main oil cylinder. The main oil cylinder is connected with an energy storage unit. When in the high position, the pedal corresponds to the extended position of the piston rod and meanwhile corresponds to the communicating state of the main oil cylinder and the energy storage unit and the oil supply brake position of a brake oil cylinder. When in the low position, the pedal corresponds to the retraction position of the piston rod, meanwhile corresponds to an access cut-off position of the main oil cylinder and the energy storage unit, and corresponds to a vehicle travelling accelerator oil supply position and an oil discharge braking relief position of the brake oil cylinder. According to the technical scheme, control can be achieved through the only one pedal, the ascending and descending motion of the pedal is the same as the accelerator pedal motion state in the prior art, it can also be interpreted as the motion of the pedal is consistent to that of a brake pedal in the prior art, and the operational motion is quite simple and completely conforms to the motion habit of a driver.