The invention provides a construction method of a direct-drive permanent magnet synchronous wind turbine generator model. The construction method comprises the following steps: 1: converting the standard parameter of a permanent magnet synchronous motor into an actual value parameter with a SI (System International) unit system; 2: converting the parameter of an electrically excited synchronous motor and the parameter of the permanent magnet synchronous motor; 3: carrying out standardization on the parameter of a new electrically excited synchronous motor; 4: establishing a constant exciting current controller model by simulation software, and calculating the initial reference value of exciting current; 5: constructing an equivalent model of the permanent magnet synchronous motor; and 6: constructing a permanent magnet wind turbine generator model. Compared with the prior art, the construction method of the direct-drive permanent magnet synchronous wind turbine generator model adopts parts of traditional power system business software which is lack of the permanent magnet motor model in a model base to establish the permanent magnet synchronous motor model or a relevant system which comprises the permanent magnet synchronous motor, and realistic difficult problems brought by the deficiency of the permanent magnet synchronous motor model are solved.