The invention discloses an active DFIG scheduling method based on the maximal reactive power margin of a wind power plant. The method comprises that set parameters, prediction data and a scheduling instruction PD of each DFIG in the wind power plant are obtained; a predicted active output value of each DFIG is calculated by combining a dynamic model of a wind mill; upper and lower limits of reactive output of each DFIG are calculated by combining reactive output characteristic of the DFIG; when an active output predicted value PF_sigma of the wind power plant is lower than the scheduling instruction PD, each DFIG generates power according to a maximal wind energy tracking principle; and when the active output predicted value PF_sigma of the wind power plant is greater than the scheduling instruction PD, a control strategy of successive distribution is adopted to schedule and distribute the active output of each DFIG in a unified way by taking maximizing the reactive power margin of thewind power plant as a control target.