The invention belongs to the technical field of ceramic membranes and discloses a silver-modified porous ceramic membrane and a preparation method and application thereof. Elemental silver is supported on the surface of porous ceramic by virtue of a silver mirror reaction, so that the silver-modified porous ceramic membrane has the advantages of good firmness and good stability, and provides a carrier for the elemental silver to obtain nano-scale elemental silver. The prepared silver-modified porous ceramic membrane can be used for purifying and sterilizing direct drinking water, so that the removal rate of microorganisms in water passing through the silver-modified porous ceramic membrane can reach 100 percent.