The invention discloses a stabilization control method of a VSC-HVDC power transmission system. The stabilization control method comprises a virtual resistance-inductance impedance stabilization control part, an output current feedforward control part, and a voltage current double-loop control part According to the virtual resistance-inductance impedance stabilization control, equivalent output impedance of a rectification station converter is corrected to be positive resistance, the damping of the system is enhanced, and the stability of the system is effectively improved, and the direct current side oscillation of the VSC-HVDC power transmission system is inhibited. According to the output current feedforward control, influences of receiving end load power abrupt changes on direct current busbar voltage are reduced, and the transient response performance of the system is improved. A direct current voltage outer ring adopts proportional plus integral control, and is used to track a direct current voltage instruction in an astatic way, and a grid-connected current inner ring adopts feedforward decoupling control under synchronous rotation coordinates, and then relatively low grid-connected current aberration is guaranteed. The stabilization control method is used for the control of the rectification station converter of the VSC-HVDC power transmission system, and the direct current side oscillation of the VSC-HVDC power transmission system is effectively inhibited, and the dynamic performance of the inversion station converter cannot be affected.