The invention relates to the technical field of electric vehicles, and in particular relates to a domain-architecture vehicle network system of an electric vehicle, a domain co-processing method and adomain control device. The domain-architecture vehicle network system of the electric vehicle comprises a vehicle switching device, a vehicle backbone network, an energy domain control device and a sub-network system thereof, a power chassis domain control device and a sub-network system thereof, a vehicle body domain control device and a sub-network system thereof, an intelligent / auxiliary driving domain control device and a sub-network system thereof, and an infotainment domain control device and a sub-network system thereof; the vehicle switching device is connected with the various domaincontrol devices through the vehicle backbone network; the various domain control devices are separately connected with the system thereof in the domain through respective vehicle sub-networks; the vehicle switching device manages interaction of the various domain control devices by adopting the domain co-processing method; and thus, cross-domain function implementation is realized. According to the domain-architecture vehicle network system of the electric vehicle, the domain co-processing method and the domain control device disclosed by the invention, implementation of multifunctional system integration of vehicles can be obviously improved; simultaneously, network congestion and delay problems are effectively inhibited; and the vehicle control reliability and real-time performance areimproved.