The invention relates to a method for preparing iron-doped TiO2 powder through a microwave solid-phase reaction and belongs to the technical field of functional materials. The method comprises the following steps: preparing an organic titanium salt and iron salt, namely respectively performing ball-milling on TiCl4, FeCl3.6H2O and an organic acid for 0.5-1.5 hours, and preparing the organic titanium salt and iron salt; and preparing the iron-doped TiO2 powder, namely uniformly mixing the prepared organic titanium salt and iron salt obtained in the previous step, adding a surfactant, performing ball-milling for 0.5-1.5 hours to obtain a precursor, roasting the precursor in a microwave reactor for 10-30 minutes, taking out the generated solid after the roasting is finished, washing, drying and preparing the iron-doped TiO2 powder. The preparation method has the characteristics that the process is simple, easy to control and high in efficiency, the synthesis cost is low, the environmental pollution is slight, the prepared powder is uniform in particle size, and the like.