The invention discloses a vehicle-mounted integrated charger based on a six-phase open winding motor driving system, which relates to a vehicle-mounted integrated charger, so as to overcome the problems that an electric vehicle motor can rotate and the charging power is low when an existing integrated charger is in a charging mode and a V2G mode. The integrated charger comprises a six-phase open-winding motor, a DC/AC power converter and a DC/DC converter. When the vehicle-mounted integrated charger works in a charging mode, electric energy outputted by grid-side three-phase power is inputtedto a storage battery to be charged through the six-phase open winding motor, the DC/AC power converter and the DC/DC converter in sequence to charge the storage battery; and when the vehicle-mounted integrated charger works in a V2G mode from a vehicle to a power grid, electric energy outputted by the storage battery is inputted to grid-side three-phase power through the DC/DC converter, the DC/ACpower converter and the six-phase open-winding motor in sequence, and the electric energy is fed back to the grid-side three-phase power.