The invention discloses an intelligent broadband communication system based on a power carrier transformer substation, which is provided with a terminal information equipment, an exchange screen and a communication cabinet and is characterized in that: the terminal information equipment is connected with a power line A through a low-voltage carrier A, the exchange screen is internally provided with a head-end carrier modem which is connected with the power line A and a power line B, and the communication equipment in the communication cabinet is connected with the power line B through a low-voltage carrier B. The intelligent broadband communication system can adopt the existing low-voltage alternating-current power supply network in the transformer substation to transmit signals, and the traditional 485 communication line, the twisted pair and other communication lines are replaced. The intelligent broadband communication system has strong anti-interference performance, low investment and low cost and does not need to be constructed on a large area to arrange wires so that the damage to the environment on site is avoided and a lot of manpower and materials are saved. The intelligent broadband communication system can be provided with a communication interface so that the newly installed equipment can be used conveniently after being inserted.