The invention relates to a brushless direct-current motor boost integrated driving system and a control method. A pre-stage Boost DC-DC converter topology circuit is formed through the coupling use ofswitching devices, and a voltage regulation effect on an input source is realized; meanwhile, a rear-stage three-phase full-bridge power converter topology circuit is formed, the output voltage adjusted by the front-stage Boost DC-DC converter serves as an input source of the rear-stage three-phase full-bridge power converter topology circuit to supply power to a brushless direct-current motor todrive, and the effect of motor speed regulation is achieved; the integrated topology is realized on a hardware circuit, an integrated control mode is realized on a system control method, and the integrated topology is simple in circuit, small in size, high in adaptability to input source battery voltage, suitable for being applied to the field of pure electric vehicles, capable of driving an electric vehicle to run and collecting braking energy under the condition that the electric vehicle brakes, the energy is saved, and the running distance of the electric vehicle is increased.