The invention relates to a method for separating and purifying effective constituents from a salvia miltiorrhiza extracting solution by applying a membrane technology. The method is characterized by comprising the following steps of: (1) preparing the salvia miltiorrhiza extracting solution; (2) carrying out solid-liquid separation; (3) carrying out microfiltration to remove sediments; (4) carrying out ultrafiltration separation; (5) carrying out nanofiltration concentration; and (6) carrying out vacuum drying. The invention takes a membrane with selective permeability as a separating medium, and the effective constituents contained in the salvia miltiorrhiza extracting solution are passed or intercepted according the size of the aperture of a filter membrane, therefore the purposes of separation and concentration are achieved; and in addition, the method better realizes the separation of the effective parts of traditional Chinese medicines, sufficiently retains the medical effect of the traditional Chinese medicines and can also outstandingly shorten the production period, reduce the production cost and the energy consumption and ensure the stability of product quality when extracted separates are used for preparing traditional Chinese medicine preparations and medicinal liquors.