The invention relates to a reactive sharing control system and method based on a voltage source inverter parallel connection system. The reactive sharing control system is characterized in that the system is formed by connection of an inverter three-phase inductance and current acquisition module, an inverter outlet voltage acquisition module, an inverter voltage rated amplitude correction module, an inverter output power calculating module, an inverter output voltage amplitude detection module, a voltage-reactive power droop control adjusting module, a frequency-active power droop control adjusting module, a virtual moment of inertia module, an integral adjusting module, an inverter phase generation module, a voltage reference signal generation module, a current loop reference signal generation module, a current loop adjusting module, and a pulse width modulation module. According to the system and method, the design is reasonable, the problem of non-sharing reactive power of each inverter in an inverter parallel connection system is solved, safe and reliable operation of the inverter parallel connection system is ensured, and important technical bases are provided for a voltage source inverter parallel connection control scheme in the distributed generation and micro-grid fields.