Primary voltage power distribution unit used for hybrid electric vehicle

The invention provides a primary voltage power distribution unit used for a hybrid electric vehicle. When a manual power source main switch is switched on, a power source main switch front branch circuit is controlled to be electrified; a driving position power source main switch is used for controlling the on-off state of a power source main switch contactor; when the switch of the power source main switch contactor is switched on, a power source main switch rear branch circuit is controlled to be electrified; the power source main switch front branch circuit is connected to devices needing to be always powered up on the vehicle; the power source main switch rear branch circuit is connected to devices needing not to be always powered up on the vehicle; the devices needing not to be powered up are also controlled by a vehicle control unit; when the power source main switch rear branch circuit is electrified, the condition that all devices which are connected to the branch circuit in a hooking way are all star