The invention provides a reaction device for synthesizing levo terpineol and relates to a reaction device with pipe type fixed bed reactors for synthesizing the levo terpineol. The reaction device mainly comprises an evaporation kettle, a condenser and 2 to 10 pipe type fixed bed reactors connected in parallel or in series. The reaction device pushes raw materials to circularly flow between the evaporation kettle and the pipe type fixed bed reactors through evaporation natural circulation, adopts evaporation and reaction separation to contribute to precisely controlling the contact time and the reaction temperature of the raw materials and a catalyst, improving selectivity of the reaction, reducing side reactions and increasing yield, is provided with an evaporation chamber and a demister on a heating kettle to contribute to separating the raw materials from the products, reducing the levo terpineol generated by the reaction and entrained to the pipe type fixed bed reactors and improving reaction efficiency, and adopts the pipe type fixed bed reactors to contribute to reducing abrasion of catalyst granules, avoiding inactivation and prolonging service life. The reaction device effectively solves the problems of low reaction selectivity, many side reactions and low yield in the conventional synthesized levo terpineol. By the reaction device, the synthetic reaction of the levo terpineol can be performed under the best process condition; and the yield can reach over 65 percent.