The utility model discloses a butterfly-shaped telephone wire laid indoors. The butterfly-shaped telephone wire laid indoors comprises a first copper conductor and a second copper conductor which are arranged in a parallel mode at intervals. The external surfaces of the first copper conductor and the second copper conductor are covered by an insulation sheath layer and are isolated from each other by the insulation sheath layer. The upper surface and the lower surface of the insulation sheath layer are both provided with wedge-shaped grooves. The wedge-shaped grooves are arranged between the first copper conductor and the second copper conductor. The minimum thickness of the insulation sheath layer is 0.4mm. The diameters of the first copper conductor and the second copper conductor are both 0.5mm. Bar-shaped gaps are arranged on above and below the first copper conductor and the second copper conductor in the insulation sheath layer. According to the butterfly-shaped telephone wire laid indoors of the utility model, cable laying is provided with great convenience; environment stress cracking resistant properties are realized; cable transmission performance is also improved; cable crosstalk is prevented; and simultaneously, the flexibility is raised.