The invention discloses a PSD-BPA-based power grid wind power integration evaluation system and method. The PSD-BPA-based power grid wind power integration evaluation system includes a data connection module, a data storage module, a data calculation module, a data analysis module and a wind power integration capability analysis and output module. According to the method of the invention, power grid basic data of PSD-BPA are automatically connected; wind power access points are introduced; the number of wind power access points is increased layer by layer; a short-circuit capacity ratio k, a voltage flicker value and harmonic content which are outputted by the data calculation module and the data analysis module are automatically compared with threshold values; and wind power installed capacity which exceeds the threshold values is the maximum wind power integration capability of a line model. According to the PSD-BPA-based power grid wind power integration evaluation system of the invention, the short-circuit capacity ratio, voltage flicker value and harmonic content are rapidly analyzed according to the line model which is built according to actual lines, and the maximum wind power integration capability of the line model can be obtained, and therefore, reference values can be provided for wind power integration, and work efficiency can be improved.