The utility model discloses a heavy-duty gas engine high-voltage wire. The heavy-duty gas engine high-voltage wire comprises a spark plug soft sheath, a UP hard tube, a sealing ring, a dust cap, a head cross handle, a bellows, a wire body, a plastic clasp, an ignition coil sheath, a high-voltage wire bottom structure and a stainless steel spark plug connecting end. The heavy-duty gas engine high voltage wire is characterized in that one end of the wire body is connected to the UP hard tube by the dust cap, the UP hard tube is connected to the spark plug soft sheath, the other end of the wire body is connected to the ignition coil sheath by the plastic clasp, and the external diameter of the wire body is surrounded by the bellows. An end portion of the inner cavity of the ignition coil sheath is provided with the high voltage wire bottom structure, an end head of the UP hard tube is provided with the sealing ring, and the UP hard tube is threadedly connected to the dust cap. The high voltage wire bottom structure is provided with stiffeners. The spark plug soft sheath is communicated to an inner hole of the wire body through an inner hole of the dust cap, and is communicated to the ignition coil sheath.