The invention belongs to the technical field of a catalyst, and particularly relates to a silver catalyst containing silver, and a preparation method and application thereof. Electrolytic silver prepared by an electrolytic process is adopted, and high-temperature treatment is carried out under existence of vapor, so that the electrolytic silver generates crystal face reconstruction, and the surface becomes coarse and irregular from a smooth state; a silver salt is loaded to the electrolytic silver after thermal treatment by an isometric steeping method; the silver catalyst containing silver loaded with silver microcrystal on the electrolytic silver is prepared in manners of baking and roasting. The catalyst contains 1-10%(wt) of silver microcrystal. The silver catalyst containing silver can be applied to catalytic oxidation of fatty alcohol or aromatic alcohol, so as to generate corresponding aldehyde or ketone in one step. Compared with the existing silver catalyst containing silver for industrial application, the catalyst is high in low-temperature activity, and good in selectivity, and the service life is obviously prolonged.