Abstract: In response to the complexity problem of traditional preset control strategies in dynamic reactive power compensation of high-voltage transmission lines, which are difficult to cope with the coupling of operating parameter perturbations and device state changes, an adaptive control method based on DDPG algorithm was studied. Online identification of parameters of high-voltage transmission lines, real-time monitoring of the operating status of dynamic reactive power compensation devices, as perception inputs, design an adaptive control strategy based on DDPG algorithm, achieve autonomous perception and random approximation optimization of dynamic reactive power compensation devices for high-voltage transmission lines, generate dynamic reactive power compensation instructions that match the operating situation of the devices, and complete the full loop closed-loop adaptive regulation from situation perception to control execution. Compared with the traditional control methods, the comparison experiment shows that the proposed method exhibits better voltage regulation accuracy and transient support performance, which verifies the feasibility and progressiveness of improving the system operation toughness and power quality in practical projects.