Double-insulation communication cable used for ventilating duct

The utility model discloses a double-insulation communication cable used for a ventilating duct. A symmetrical data cable comprises four pairs of twisted pair wires and a jacket for outer coating, wherein, each pair of the twisted pair wires comprises two core wires that are intertwisted into a wire pair; each core wire comprises an conducting body and an insulation layer coating the outside surface of the conducting body; and the insulation layer is made of polythene and fluoroplastic. The double-insulation communication cable adopts MFA (fluoroplastic) to protect PE (polythene) inner layer insulation and the conducting body in an insulating manner; and the inner layer insulation adopts the PE instead of the MFA, and the consumption of the MFA is reduced greatly, thereby achieving the effect of lowering the cost and achieving greater economic effect.