This paper presents the design of an active biquad audio amplification circuit based on an AGC circuit. The objective of the study is to achieve frequency splitting and power amplification of audio signals by using an active biquad network. The entire circuit consists of three main modules: the preprocessing circuit, the high-pass and low-pass filtering circuits, and the power amplification circuit. In the design, a signal generator is employed as the signal source. The first stage of the preprocessing circuit utilizes an AGC circuit, which implements automatic gain control through negative feedback. The second stage filtering circuits employ passive filters, while the power amplification stage incorporates the specialized Hi-Fi power amplifier chip TDA2030. Voltage followers are used between different stages to ensure impedance matching. Through simulation verification, this design has been demonstrated to meet the requirements effectively, yielding highly satisfactory results.