Multifunction vehicle bus (MVB) branching apparatus and system

The utility model provides a multifunction vehicle bus (MVB) branching apparatus and system. The apparatus comprises three connectors comprising main road pins, secondary road pins and connector plugs; the main road pins are in electric connection through a main road node; the secondary road pins are in electric connection through a secondary node; the three connector plugs are respectively in electric connection with an input MVB device, an output MVB device or element, and a first test device, so as to allow the MVB device to send an input MVB device signal to the output MVB device or element and the first test device; the first test device tests the input MVB device signal, thereby realizing normal communication among MVB devices in an MVB, meanwhile testing MVB device transmission signals, and guaranteeing transmission signal accuracy in the MVB.