The invention discloses a power line carrier communication routing device, comprising a ground wire and null line carrier coupling circuit which is connected with a ground wire and a null line, and a phase line and null line carrier coupling circuit which is connected with a phase line and the null line. A ground wire and null line physical channel and a phase line and null line physical channel formed by the ground wire and null line carrier coupling circuit and the phase line and null line carrier coupling circuit forward carrier signals mutually. The ground wire and null line physical channel will not directly being influenced by the bad degree of a power line communication environment and the variability and high noise of a power grid load, the equivalent resistance of a power load in the ground wire-null line channel is very high, the transmission of the carrier signals in the ground wire and null line physical channel will not be excessively interfered by external complex signals, and the long-distance transmission reliability, high efficiency and stability of the carrier signals can be greatly improved.