The invention provides a method and a device for online teaching of a whole automobile. The device comprises the whole automobile, a fault setting case, a remote console, a communication cable, an automotive electric signal testing device, a network interface and a data interface. The invention is characterized in that: when an automobile is in a running state on the road, the automobile is connected with the fault setting case, so the device can set 50 classic faults in different types manually when the automobile runs, and can test 123 electric signals; and when the automobile is in an idle-speed state in a laboratory, the automobile is connected with the remote console, so the device can set 50 classic faults in different types by a mouse of a computer, can be interconnected with a campus network, other automotive assembly training platforms and automotive electric signal testing devices through the remote console, and form a whole automobile online teaching device which can realize free access, interaction of software and hardware and integration between internet and reality together with embedded instructional software.