The invention discloses porous ceramic with good drainage performance and a manufacturing process. The porous ceramic employs silicon carbide, pottery clay, mullite, and iolite as aggregates; wollastonite and spodumene are used as auxiliary materials, and low temperature ceramic glaze powder is used as a fluxing agent; bamboo charcoal and wood chip are used as pore forming agents; the raw materials are prepared according to a certain proportion, paraffin is used as a binder for preparing a slurry, a hot pressure casting and forming machine is used for preparing green compacts, and one-time wax discharging and sintering are carried out by a kiln in order to obtain finished products. Compared with prior art, the product has the functions of common porous ceramics, such as filtering, heat insulation, noise abatement and the like, and the product is characterized in that the product has liquid drainage, penetration, adsorption and fine filtering and other excellent functions, and at the same time, the product has high temperature resistance, quenching and quick heating resistance, and good thermal conductivity; in addition, the common ceramic raw materials are selected, and the porous ceramic has the advantages of low energy consumption, environmental protection without secondary pollution, low cost, and simple technology, and the ceramic is suitable for large scale production. The porous ceramic has wide applications and extremely good development prospects.