The invention relates to the extraction technology of a rhizoma coptidis total alkaloid and the process flow is as follows: raw materials (rhizoma coptidis or coptis fibrous roots or coptis leaves), pulverization (Coptis fibrous roots or coptis leaves need no pulverizing.), addition of right amount of sulphuric acid of 0.01 to 10 percent for soaking, heated extraction for four times, preconcentration, sediment of sodium chloride and high-valencied metal salt, filtration, drying and products of rhizoma coptidis total alkaloid. The main active ingredients for the product are berberine, coptisine, jateorrhizine, palmatine, epiberberine and other active coptis ingredients, the content of rhizoma coptidis total alkaloid is over 20 percent, wherein, the content of berberine is over 10 percent. The product adopts coptis fibrous roots and so on as raw materials to extract rhizoma coptidis total alkaloid, which is different from the traditional extraction of berberine. The extraction technology improves the pure quotient of the product and particularly eliminates cold-natured ingredients of toxic and side effect through the operating procedure of impurity eliminating, thereby improving the product quality. Besides the traditionally-utilized berberine, the product still contains a large quantity of other active coptis ingredients such as coptisine, jateorrhizine, palmatine, epiberberine and so on. The product has a higher utilization rate of resources and a higher security of products, and the effective function and action of rhizoma coptidis can be brought into a better play.