Provided is a monatomic amorphous palladium, a method for preparing the same and use thereof. The method comprises a) loading a monatomic palladium powder on a silicon nitride substrate; b) heating the silicon nitride substrate loaded with the monatomic palladium powder obtained in a) up to a temperature of 800° C. to 1000° C. and keeping the temperature for at least 3 minutes; and c) cooling a system of palladium and silicon nitride obtained in b) to room temperature at an apparent cooling rate greater than 103° C./second, thus obtaining the monatomic amorphous palladium.