The invention relates to the technical field of new energy, in particular to an improved multi-machine parallel PMSG grid-connected active support control structure based on a VSG. The structure can actively support the frequency and voltage of a power grid, and comprises a host side converter, a fan and a generator which are connected with the host side converter, a network side inverter and a plurality of parallel sub-modules, each sub-module comprises a fan, a generator and a machine side converter, and the host side converter is used for maintaining the voltage of a direct current side capacitor; a sub-module machine side converter is used for controlling other wind driven generators to output active power; and the network side inverter controls the magnitude of power input to the gridpower according to an MPPT algorithm, a VSG control strategy is adopted, and active support is provided for power grid frequency and voltage at the moment of dynamic response by releasing rotor kinetic energy and reserved energy. According to the invention, the problems existing in multi-point frequency regulation decentralized control are improved, frequency regulation can be performed together,and the system stability is improved.