The invention discloses a method for extracting phytosterin from bamboo or wood, which comprises (1) using
solvent to obtain extract from bamboo or wood, evaporating at 5-100DEG C and 0-0.99MPa, recovering
solvent and obtaining extract, (2) arranging the extract in a thermal
cracking furnace, feeding
inertia gas, increasing temperature to 300-800DEG C,
processing directional thermal
cracking in the presence of catalyst, cooling thermal
cracking steam and obtaining thermal cracking product, (3) at 50-200DEG C and 0-0.1MPa vacuum degree, removing thermal cracking product from the material with low
boiling point, and at 150-300DEG C and 0-0.99MPa vacuum degree,
steaming out phytosterin. The invention can improve the added values of bamboo and wood, and release the lack of
medicine phytosterin, with significant social, environment and
economic benefits, while the invention has simple process, easy operation, better
controllability, low cost, industrial production and wide application.