The phase-locked loop (PLL) technology is an electronic feedback control system primarily used for synchronizing the frequency and phase of signals. The traditional proportional-integral (PI) control method is widely applied due to its simple implementation, fast response, and high control accuracy. However, this method faces challenges in determining controller parameters and exhibits weak anti-interference ability and robustness when dealing with external disturbances. To address these issues, this paper proposes a phase-locked loop control technique based on self-coupled PI (SC-PI) control. The SC-PI control method maps the nonlinear phase-locked loop system into an equivalent linear system and introduces a speed factor zc to couple the proportional and integral components. This coupling ensures that each gain in the SC-PI control has the same physical dimension. Finally, fuzzy rules are employed to tune the SC-PI control parameters. Simulation results using Simulink demonstrate that the phase-locked loop technology based on SC-PI control exhibits significant advantages in terms of response speed, anti-interference performance, and robustness, making it of significant practical value.