The invention relates to an operation data-based wind power farm active power and reactive voltage control capability valuation method. The method comprises the following steps: instruction data, real power and voltage data of a wind power farm AGC and AVC system are collected; response time, overshoot quantity and response deviation value are calculated upon each active power control and voltage control operation; a weighted average mode is adopted; different weights are set for the response time, the overshoot quantity and the response deviation value; response characteristic of the active power control and voltage control of a wind power farm can be obtained. Average value of all indexes of the response characteristic of the active power control and voltage control is calculated each month; performance check indexes for the active power control and voltage control of the wind power farm can be obtained based on operation data and combination of a plurality of calculation modes. Via the method disclosed in the invention, an evaluation means for active power control and reactive voltage control characteristics of the wind power farm can be provided, and optimal dispatching and operation of the wind power farm can be facilitated.