The invention discloses a wire harness which comprises a number of connecting wires and high temperature resistant connectors arranged on both ends of the connecting wires. Each connecting wire comprises a conductor. Each conductor is covered by ceramic silicon rubber. The ceramic silicon rubber is covered by a high temperature mineral wrapping tape. A number of thin steel wires are arranged in the gap between the ceramic silicone rubber and each high temperature mineral wrapping tape, and an inorganic mineral oxygen barrier layer is filled in the gap. Each inorganic mineral oxygen barrier layer comprises magnesium hydroxide and aluminum hydroxide. Each high temperature mineral wrapping tape is covered by a light-emitting layer which is electrically connected with the high temperature resistant connectors. Each light-emitting layer is covered by a transparent insulating layer. When the wire harness works, due to the light-emitting layers, the working state of the wire harness can be prompted. The wire harness has the great performance of high temperature resistance, can provide more time for power and data transmission in fire, effectively prevents data loss, and ensures information and power transmission and safe operation of electrical equipment and lines.