The invention relates to a method for preparing a CeO2/TiO2 low-temperature SCR catalyst by using Ce-MOF as a cerium precursor, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: (1) weighing a fixed quantity of a cerium source and an organic ligand, dissolving the cerium source and the organic ligand in a proper amount of a solvent, and preparing a cerium-based metal organic framework material (Ce-MOF) by adopting a solvothermal method; (2) weighing and dissolving a fixed quantity of a soluble titanium source in a certain solvent,adding the Ce-MOF prepared in the step (1), and preparing a catalyst precursor by adopting a coprecipitation method; (3) putting the catalyst precursor obtained in the step (2) into a muffle furnacefor calcination treatment. Therefore, the CeO2/TiO2 low-temperature SCR catalyst prepared by using the Ce-MOF as a cerium precursor can be obtained. According to the preparation method provided by the invention, the preparation condition is easy to control, the preparation process is simple, and the prepared catalyst has excellent catalytic activity and good sulfur resistance and water resistancefor NH3-SCR reaction.