The present invention discloses a direct current brush motor control method with a variable driving mode. The concrete realization process comprises: performing section division of the current of the motor, dividing the current into big current and small current, wherein the current being larger than 15 amperes is taken as the maximum current, and the current being smaller than 15 amperes is taken as small current. When the current of the motor is small current, a bipolarity control mode is employed, and when the current of the motor is big current, an unipolarity control mode is employed, a switching work range is selected at the joint of the big current and the small current, and the employed control mode performs retardation switching of the unipolarity and bipolarity control method at the switching work range. The coexistence of the unipolarity and bipolarity control method is realized, the real-time dynamic switching is realized, and two control modes are reasonably utilized; the control precision of the brush motor is improved at the small current works; the system loss of the brush motor is reduced when the big current works; and the electromagnetic interference of the brush motor is reduced when the big current works.