The invention discloses a preparation method of carbon-loaded palladium powder serving as a formaldehyde remover. According to the method, nanoparticles are formed on the surface of an activated carbon carrier by Pd by taking EDTA as a complexing agent and ammonia borane as a reducing agent. The carbon-loaded palladium powder serving as the formaldehyde remover has a very large catalytic specificsurface and relatively good performance and can catalyze formaldehyde to oxidize at about 40 DEG C to generate carbon dioxide and water. The carbon-loaded palladium powder is flexible in using mode and relatively wide in treatable gas concentration range, and can be combined with heaters and solar thermal collectors and the like to remove indoor formaldehyde efficiently.