Provided is a composition for improving blood circulation, comprising an extract of Lindera obtusiloba as an active ingredient, and more specifically, to a pharmaceutical composition and a health functional food for preventing and treating thrombotic disorders by improving blood circulation, comprising an extract of Lindera obtusiloba as an active ingredient. The extract of Lindera obtusiloba of the present invention and a crude purified product thereof can be obtained through extraction using various solvents such as water, ethanol, methanol, butanol, etc. Since the extract and the crude purified product have not only excellent inhibitory effect on platelet aggregation induced by various aggregation inductions in vitro, but also excellent inhibitory effect on rapid thrombus formation in vivo, they can be useful for preventing and treating diseases caused by blood circulation disorders such as thromboembolism, etc.
