The utility model provides an emergency brake anti-faulty-pedaling accelerator pedal device of a hydro-electric automobile. The emergency brake anti-faulty-pedaling accelerator pedal device comprises an accelerator pedal and a brake pedal. A hydraulic anti-faulty-pedaling linkage device is arranged on the accelerator pedal, and the hydraulic anti-faulty-pedaling linkage device is composed of a push rod, a piston cylinder, a diaphragm, a control valve and a liquid storage tank. One end of the push rod is connected with a hinging shaft on the accelerator pedal, and the other end of the push rod is hinged to a piston of the piston cylinder. The liquid storage tank is arranged above a cylinder body of the piston cylinder and the control valve is arranged between the cylinder body and the liquid storage tank. The diaphragm is arranged inside the cylinder body, a power assisting motor circuit connection and disconnection switch is arranged on the diaphragm, a power assisting motor circuit contact is arranged at the right end of the cylinder body, one end of the power assisting motor circuit contact is connected with a storage battery low-voltage loop in series, the other end of the power assisting motor circuit contact is connected with a power assisting motor, a motor speed reducer is further arranged on the power assisting motor, and the motor speed reducer is connected with a brake pedal arm through a stay wire. The emergency brake anti-faulty-pedaling accelerator pedal device of the hydro-electric automobile can be operated normally, is simple in structure, low in cost and accurate in brake, can effectively avoid train operation accidents caused by faulty pedaling of the accelerator pedal, and improves the safety of the automobile.