The invention provides a microwave continuous suspension roasting method for strengthening the dissociation of complex refractory iron ores. The method adopts a microwave continuous suspension roasting system, and comprises the following steps of (1) crushing and grinding the complex refractory iron ores and then pouring into a feeding bin, and conveying to a pretreatment fluidization device; (2)introducing protective gas into a pretreatment feeding chamber and a pretreatment discharging chamber to enable iron ore powder to be in a fluidized state; (3) starting a microwave generation device,heating the iron ore powder through a microwave cavity, and then entering a reduction fluidization device; (4) introducing the protective gas into a reduction feeding chamber and a reduction dischargechamber correspondingly; when the temperature is reduced to 450 - 650 DEG C, introducing reducing gas to carry out reduction magnetization roasting, and enabling reduction material to enter a cooler;and (5) cooling the reduction material to be below 100 DEG C and then entering a collecting tank. According to the microwave continuous suspension roasting method, the dissociation degree and the grinding degree of mineral monomer can be remarkably improved, and the resource recovery and high-efficiency development and utilization of the complex refractory iron ores are realized.