An on-board voice enhancer (3), an on-board voice enhancing system, and an on-board voice enhancing method. The on-board voice enhancing system comprises voice collecting microphone assemblies (1, 2), an on-board voice enhancer (3), and an on-board FM broadcasting assembly (4); the voice collecting microphone assemblies (1, 2) are connected to at least one voice collecting microphone binding post (33, 34) of the on-board voice enhancer (3) by means of a signal line. An on-board diagnostics OBD interface (37) of the on-board voice enhancer (3) is inserted at a controller area network (CAN) port in a car cockpit
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