The invention provides a data transmission cable. The data transmission cable comprises a first wire and a second wire, wherein the first wire and the second wire are arranged adjacent to each other and respectively is provided with a conductor and a coating layer, the conductor is arranged at a central position, the coating layer wraps the conductor, and the external diameter of the conductor is within a range of 28-31 American wire gauge (AWG); when the external diameter of the conductor employs 28AWG, the central distance between the first wire and the second wire is set to be 0.51-0.75 millimeter; when the external diameter of the conductor employs 29AWG, the central distance between the first wire and the second wire is set to be 0.38-0.75 millimeter; and when the external diameter of the conductor employs 30-31AWG, the central distance between the first wire and the second wire is set to be 0.38-0.62 millimeter.