The invention provides a regular-hexagon flux trajectory two-phase control device and a regular-hexagon flux trajectory two-phase control method. The regular-hexagon flux trajectory two-phase control device comprises a vehicle-mounted power battery, an auxiliary power supply, a main controller, a driving circuit, a three-phase permanent magnet synchronous motor and a power tube unit, wherein the effect of controlling a flux trajectory of the three-phase permanent magnet synchronous motor is realized through controlling switching tubes of the power tube unit by means of the main controller. During the control process, the control of the flux trajectory of the three-phase permanent magnet synchronous motor is realized through controlling the switching tubes of the power tube unit directly, complex links such as vector transformation are not needed, the control process is simple, and the response speed of the three-phase permanent magnet synchronous motor is increased. Meanwhile, in the embodiment of the regular-hexagon flux trajectory two-phase control device, the power tube unit only comprises five switching tubes, the number of switching tubes is small, and the cost is low.