Automobile bus system

The invention is applicable to the technical field of automobile local area network, and provides an automobile bus system which comprises a main control unit and at least one driven control unit. The main control unit and the driven control units are connected by a bus while the driven control units are also connected by the bus. The main control unit or each driven control unit further comprises a receiving drive unit, a receiving state machine unit, a processing unit, a sending state machine unit and a sending drive unit, wherein the receiving drive unit adopts a differential driving unit which is different from the existing single-end driving manner. accordingly, interference resistance capacity of the automobile bus system is improved, and reliability of data output from the receiving drive unit is output.