The invention provides a whole vehicle control device and control method for an electric vehicle. The control device comprises a whole vehicle control unit, a digital intelligent display screen, a motor control unit, a drive motor, a power battery pack and a battery management unit, wherein the whole vehicle control unit is respectively connected with the digital intelligent display screen, the motor control unit and the battery management unit through communication buses; the drive motor is in two-way connection with the motor control unit respectively through a signal wire harness and a power supply wire harness; the battery management unit is connected with the power battery pack through a detection signal wire harness. The battery management unit comprises a plurality of single power battery protection circuits, a low-electricity-quantity warning signal drive circuit, a discharging protection signal drive circuit and a charging protection signal drive circuit, and the whole vehicle control unit comprises a main control chip, a power input and adjustment port circuit, a separation sensor signal input port circuit, a communication port and a digital intelligent display screen output port circuit. According to the whole vehicle control device and the control method, safety performance is improved, energy is saved and low-carbon performance and environment protection are achieved.