As ‘new energy’ vehicles have become more popular, V2G (Vehicle-to-Grid) technology has received increasing attention. Aiming at the low inertia characteristics of electric vehicles integrated into the switching network, this paper selects Virtual Synchronous Generator (VSG) control technology as a control scheme. Combining the characteristics of the power angle curve and the moment of inertia of synchronous generators, an adaptive virtual synchronous generator (VSG) control algorithm for moment of inertia is proposed. By using the characteristics of first-order inertia between the power variation of the active rotor and the frequency variation, the adaptive control algorithm of the moment of inertia is designed by analyzing the relationship between the moment of inertia and the time constant of the first-order inertia link. The relationship between the adjustment, damping and droop coefficients of the synchronous generator is analyzed. Finally, the model is built on the Simulink simulation platform to verify the effectiveness of the proposed algorithm. This work is supported by the National Natural Science Foundation of China (No. 51277056).