The invention discloses a cellulose based beer stabilizer, and belongs to the field of food. The cellulose based beer stabilizer is prepared from the following components in parts by weight: 3-18 parts of microcrystalline cellulose, 4-12 parts of sodium carboxymethyl cellulose, 3-5 parts of an effervescing agent A component, 4-7.2 parts of an effervescing agent B component and 0.5-2 parts of a plasticizer. The preparation steps are as follows: (1) performing alkali treatment on microcrystalline cellulose; (2) preparing sodium carboxymethyl cellulose / effervescing agent A component / effervescing agent B component granules; (3) premixing the treated microcrystalline cellulose with the sodium carboxymethyl cellulose / effervescing agent A component / effervescing agent B component granules, and adding the plasticizer to press tablets. According to the invention, the adsorption and flocculation properties of the microcrystalline cellulose and the sodium carboxymethyl cellulose are comprehensively utilized, the prepared cellulose based beer stabilizer is a tablet and is capable of being quickly dispersed in water, the adding manner is simple, the energy consumption in the dissolution process is reduced, and the problems of time consumption, agglomeration, settlement and other problems in the dissolution or dispersion process of a common stabilizer are avoided as well.