Circuit for transmitting video signal of two-wire system video door phone system

The invention discloses a circuit for transmitting a video signal of a two-wire system video door phone system. According to the circuit, the video signal can be effectively subjected to balance and unbalance conversion processing, so that anti-interference performance of the video signal is improved. The circuit for transmitting the video signal of the two-wire system video door phone system, which is provided by the invention, comprises a first resistance R1 and a first capacitance C1 which are used for coupling the video signal, wherein the video signal sequentially passes through the first resistance R1 and the capacitance C1; and the other end of the first capacitance C1 is connected with a first common mode choke T1.