The invention relates to the technical field of extraction processes, and particularly relates to a process for extracting rosmarinic acid from rosemary. The process comprises the following steps of S1, soaking: crushing the rosemary to be powdery, and then soaking by using ethanol; S2, extraction: carrying out reflux extraction on the powdery rosemary by using the ethanol, and carrying out ethanol washing to subsequently obtain primary eluant; S3, adsorption: adsorbing the primary eluant through NK109 resin, and carrying out the alcohol washing to subsequently obtain secondary eluant; S4, crystallization: afterwards, carrying out active-rock discoloration on the secondary eluant, repeatedly extracting for 4 to 6 times by utilizing an extraction agent, taking an extraction agent layer, andcarrying out low-temperature crystallization and recrystallization; S5, drying: drying a crystal obtained in the former step, so that the rosmarinic acid can be subsequently obtained. According to the process, relative to a conventional extraction method of the rosmarinic acid, a method is simple and convenient, is easy to realize, and is safe and nontoxic; moreover, an extraction amount is large; the quality safety of a product is guaranteed, and a cost can be effectively decreased.