Disclosed in the present invention are a mobile terminal-based HAC system and an implementation method thereof. The mobile terminal-based HAC system comprises a mobile terminal and a coil accessory; the coil accessory comprises an audio plug and a magnetic induction coil connected to the audio plug; the mobile terminal comprises a mobile terminal body, a main board, an audio interface circuit and an audio jack, the main board and the audio interface circuit are provided in the mobile terminal body, the audio jack is formed on a side edge of the mobile terminal body, and the main board, the audio interface circuit, and the audio jack are connected in sequence.