The invention belongs to the technical field of microcosmic location selection of a wind power plant, and particularly relates to a method for calculating a parabolic wake flow model of a wind power unit by considering influence of turbulence intensity. The method comprises the following steps of S1, assuming that the radius of a wake flow region is linearly increased and the radius of a wake flow region close to the back part of a wind wheel is the same as that of the wind wheel, and calculating the radius r of a wake flow region in the position of a back axial distance x of the wind wheel; S2, assuming that a wind velocity in the position of the back axial distance x of the wind wheel is uniformly distributed in a radial direction, and obtaining a uniform wind velocity v* according to mass conservation; S3, according to the mass conservation and the uniform wind velocity v*, obtaining a wind velocity v of any point on a horizontal plane of the height of a hub; S4, considering an influence of the turbulence intensity of the wake flow region on a wake flow recovery coefficient k, and by referring to an empirical formula for calculating additional turbulence intensity of blade rotation, obtaining a calculation formula of the wake flow recovery coefficient k; and S5, substituting the wake flow recovery coefficient k into the calculation formula of the window velocity v, thereby obtaining an empirical wake flow model of wind velocity distribution of the wake flow region of the wind power unit.