There is an active power transient oscillation problem in a virtual synchronous generator (VSG) when there are external disturbances. This paper proposes an active power oscillation suppression strategy for a VSG parallel system based on frequency lead correction. First, a small signal model is established for the active power loop of the VSG parallel system and the VSG active power oscillation mechanism is analyzed when the load power suddenly changes. Then, based on the differential advance correction idea and combined with the VSG active power loop control structure, the active power is fed back to the frequency deviation, thereby increasing the system damping degree and suppressing the transient oscillation of the VSG parallel system active power. Next, an improved VSG parallel system state space model is established and the dynamic response performance of the system through root locus analysis is analyzed. Finally, Matlab/Simulink simulation and experimental verification show that the proposed scheme can effectively suppress transient active power oscillation in a VSG parallel system without affecting their steady-state active power characteristics.