A special organic silicon defoamer for the textile industry is prepared from raw materials in parts by weight as follows: 3-5 parts of petroleum sulfonic acid, 2-4 parts of hexamethylenetetramine, 5-17 parts of dialdehyde starch, 8-16 parts of polyvinyl acetate, 12-22 parts of white carbon black, 5-7 parts of polyether modified silicone, 3-5 parts of polyoxyethylene sorbitan fatty acid ester, 2-6 parts of thiodiglycol, 4-7 parts of thiourea dioxide, 5-8 parts of sodium hydrosulfite, 8-14 parts of a thickener, 4-7 parts of silicone oil with low hydrogen content, 2-5 parts of hydroxy-terminated polydimethylsiloxane, 4-7 parts of aluminum trioxide and 2-4 parts of sodium chloride. The special organic silicon defoamer for the textile industry has the benefits that the defoamer has the characteristics of fast defoaming, good foam inhibiting performance, stable chemical property as well as heat resistance.