The invention discloses a thermal power generating unit AGC control method based on wind power load change speed and a thermal power generating unit AGC control system based on wind power load changespeed. The system comprises a real-time load measurement device, a deviation calculation module ADD, an absolute value calculation module, an input switching module T, a proportional coefficient adjusting module F1(x), an integral time adjusting module F2(x), a feedforward coefficient adjusting module F3(x), an AGC instruction input module, a feedforward instruction module MUL and an AGC PID controller. The technical characteristics of the wind power generating and thermal power generating AGC mode operation unit are comprehensively considered, the adjuster control parameters of the thermal power generating unit AGC control system in the power grid are dynamically changed according to the wind power generating load change speed in the regional power grid and the adjusting capacity of the thermal power generating unit AGC is enabled to be closely related to the change speed of the wind power generating load so that the quick adjusting capacity of the power grid can be enhanced on the basis of the stability of the control system and the technical support can be provided for stable operation of the power grid.