The invention discloses a method for preparing flaky metal carbonyl powder, and belongs to the technical field of powder metallurgy. The method comprises the following process steps: taking solid particles as a template; putting the solid particle template into a vapor deposition reaction chamber, heating to between 180 and 450DEG C, introducing 1 to 20 volume percent metal carbonyl complex gas, starting a shocking device of a vapor deposition reactor, and decomposing and depositing the metal carbonyl complex on the surface of the solid particle template for 0.5 to 3 hours; and taking the solid particles deposited with metal carbonyl, dissolving with hot water to remove the solid particle template and filter the solid particle template, and drying to obtain the flaky metal powder. The method has the advantages of simple process, controllable size and thickness of the flaky powder, and wide application.