The invention belongs to the field of wireless communication, and specifically provides a broadband double-balanced large dynamic automatic gain control circuit. The circuit comprises an input broadband Balun (Balance-Unbalance), an output broadband Balun, a linear power supply, and two symmetrical signal links. A radio-frequency input signal is coupled by the input broadband Balun into two balance signals of which the phase difference is 180 degrees, the two balance signals are respectively input to the two signal links, and the output signals of the two signal links are coupled by the output broadband Balun into a single signal for output. In each signal link, an input signal sequentially passes through a first input broadband impedance converter, a first variable gain amplifier, a second input broadband impedance converter and a second variable gain amplifier. According to the invention, an improved balance structure and an improved way of cascaded connection are employed, signal phase and amplitude offset is used reasonably, and the second-order linearity and third-order linearity of the automatic gain control circuit are improved.