The invention discloses a multi-target control method for a VSC (voltage source converter) under an unbalanced power grid based on a particle swarm algorithm. The multi-target control method gives consideration to output three-phase power grid current, output active power and output reactive power of the VSC, control performances of the output three-phase power grid current, the output active power and the output reactive power can be controlled in a multi-target optimized manner, codes of the particle swarm algorithm are simplified, computing time is short, real-time computing can be realized, the running control performance of the VSC under the condition of unbalanced power grid voltage can be effectively improved, and quality of electric energy and stability and safety of an electric power system are ensured. By the aid of vector proportional-integral control or proportional-integral resonance control technology, angular frequency is obtained by performing vector proportional-integral control or resonance control on double fundamental frequency, and negative influence caused by negative sequence components in the power grid voltage can be restrained.