The invention provides a porous ceramics composition, a preparation method and application thereof, relating to a ceramic material. The porous ceramics composition comprises the following raw materials of 1 percent of powder particle body as a major material, 0.05-0.5 percent of binding agent, 0.01-0.4 percent of pore generating agent and 0.01-0.5 percent of dispersing agent. The preparation method comprises the steps of: adding the binding agent, the pore generating agent and the dispersing agent in the powder particle body used as the major raw material, mixing and stirring to obtain slurry; and carrying out a wet processing method or dry processing method on the slurry to obtain the finished product. The porous ceramics composition can be applied to the fields of a heat radiating assembly, a heating assembly, a heat exchange assembly, a heat conduction assembly, a heat insulation assembly, a catalytic catalyst carrier, a filtering assembly, a power generating assembly, a light-emitting assembly, a temperature-sensing assembly, a pressure-sensing assembly, a light-sensing assembly, a high temperature electrolysis isolation membrane assembly, a far infrared emitting assembly, an electromagnetic radiation reducing assembly, a battery assembly, a semiconductor module, a dehumidifying assembly, a water seepage brick, a drill cutting assembly, a die assembly and the like.