The invention discloses a wind power confidence capacity value (CV) evaluation method suitable for use in a high-wind-power-penetration-rate power system. The method includes the following steps: S1,selecting a study object, and respectively acquiring a wind power installed-capacity value C of wind turbines, a wind power time-sequence history output per-unit value curve P(t) and a time-sequence load demand curve P(t) of corresponding time; S2, calculating a wind power history output actual-value curve P(t); S3, calculating a net-load time-sequence curve P(t); S4, calculatinga net-load duration curve P(t); S5, calculating a load duration curve P(t); S6, calculating effective load carrying capability ELCC(t) of wind power; S7, calculating a confidence capacity value CP of wind power; and S8, calculating a wind power capacity value confidence level CV. The method has the advantages that: a concept is simple and clear, data demand is simple, the wind power confidence capacity value can be obtained simply through processing the history wind power output and the load curves of a study area, the wind power confidence capacity value is evaluated in a case of a high wind power penetration rate, a power system planning scheme is optimized, system running, reliability evaluation and the like are arranged, and the method has better practical guidance significance and application values.