The invention discloses a method for preparing a manganese-doped perovskite microstructured ring/rod. The perovskite microstructure is a Mn: C4N2H14PbBr4 perovskite microstructure. The preparation method comprises the following steps: preparing a two-dimensional photonic crystal mold plate, namely spinning polystyrene microsphere suspension on a substrate, evaporating off water completely so as toobtain the two-dimensional photonic crystal mold plate, and heating the mold plate for different time; preparing a perovskite precursor solution, namely firstly synthesizing C4N2H14Br2, secondly, dissolving C4N2H14Br2 with PbBr2 and MnBr2 into dimethyl sulfoxide in a certain ratio so as to obtain the perovskite precursor solution; preparing the perovskite microstructure, namely spinning the perovskite precursor solution on the two-dimensional photonic crystal mold plate, drying, soaking with methylbenzene so as to remove polystyrene microspheres, thereby obtaining the perovskite microstructure. The method is simple to operate and low in operation process difficulty, and both the size and the light emission wavelength of the perovskite microstructure can be adjusted.