The invention relates to a porcelain bead blocking agent, which is prepared from the following raw materials by weight: 1-2 parts of china clay, 1-4 parts of microbeads, 0.2-2 parts of an exciting agent, 1.5-5 parts of cement, and 2-20 parts of water. The production method of the porcelain bead blocking agent includes the steps of: mixing the china clay, the microbeads, the exciting agent and the cement according to the above formula proportion, and stirring them for 20-30min; adding water in accordance with the formula proportion to undergo dispersion reaction for 1-3 hours; and at the end of the reaction, conducting subpackaging into barrels, thus obtaining the product. In terms of use, a porcelain bead blocking layer made of the porcelain bead blocking agent provided by the invention is disposed between a structure layer and a waterproof layer. With an excellent waterproof effect, the porcelain bead blocking agent provided by the invention is in line with the environmental friendly, gas permeable and durable waterproof and anti-permeability requirements of buildings.