The invention discloses a unit forced excitation and direct current emergency power support coordination control method based on wide-area measuring information, and relates to the field of safety and stability control of an electric power system. According to the method, the system real-time operation condition is generated based on the wide-area measuring information, the emergency control quantity required by instable contingency is calculated by employing the extended equal area criterion, the generator tripping and load shedding control costs are reduced by performing direct current emergency power support in advance, and the direct current short-line voltage is stabilized by employing synchronous unit forced excitation with high direct current power fluctuation sensitivity so that the direct current emergency power support control effect and system transient stabilization margin are improved.