The invention discloses an AGC hierarchical coordinative control method based on the security constraint of stable cross ection, comprising the following steps: a main control area is established in the system; the area is divided into N sub-control areas; all online controllable machine sets in the sub-control areas are equivalent to an equivalent virtual machine set of the superior control area; the control parameters such as the actual output, regulation speed and the like of the equivalent virtual machine set are obtained by summarizing all the online controllable machine set parameters of corresponding sub-control area; and the regulating quantity burdened in the distribution link of the superior control area is the total regulating quantity of the corresponding sub-control area and then is issued after a secondary distribution of the machine sets in sub-areas. By the steps, the invention can not only ensure that the stable cross section operates without exceeding the limitation, but also meet the conventional AGC control; and the method can avoid cross-section control failure caused by the fault of network analyzing software, and is easy to be applied to engineering and independent from the network analyzing technology.