The invention discloses a preparation technology of
sclareol, which adopts a molecular still with a distance of 2cm to 5cm between an evaporating surface and a condensing surface. The technology of the invention is characterized in the operation under the following technological conditions is carried out and comprises the following steps of: operating pressure for the still is 1Pa to 150Pa, distilling temperature is 100 DEG C to 400 DEG C,
cooling temperature is minus 8 DEC G to minus 15 DEG C, rotating speed of a
film applicator is 10rpm to 300rpm, remains of the first-step
distillation are deemed as raw materials for a next
distillation and are taken 2 times to 3 times of
distillation, temperature contrast between the evaporating surface and the condensing surface is kept as 175 DEG C to 275 DEG C for each time of distillation, so as to completely separate and extract
sclareol from clary sage concrete and to ensure the yield of
sclareol to reach 98 percent. The technology of the invention has advantages of simple technology, short
operating time, nonuse of
solvent, nonproduction of other high boiling materials and
pollution-free. The technology of the invention has high efficiency on extracting the sclareol, high product yield and high benefit, and is applicable to large-scale production of the sclareol.