The invention discloses a walnut oil capable of expelling wind and removing cold. The walnut oil is prepared from following raw materials, by weight, 250 to 260 parts of Juglans cathayensis Dode var. formosana (Hayata) A. et R.H.Chang, 30 to 40 parts of flaxseed, 70 to 80 parts of zanthoxylum armatum DC., 50 to 60 parts of coconut shell, 110 to 140 parts of apricot kernel, 110 to 140 parts of processed rhizoma pinelliae, 60 to 90 parts of semen coicis, 60 to 90 parts of talc powder, 20 to 30 parts of ricepaperplant pith, 20 to 30 parts of amomum cardamomum, 20 to 30 parts of bamboo leaf, and 20 to 30 parts of mangnolia officinalis. According to a preparation method, zanthoxylum armatum DC. is capable of expelling wind and removing cold; apricot kernel is bitter and warm, is capable of dispersing and smoothing upper-jiao lung Qi, dispersing dampness with Qi, and promoting upper-jiao; amomum cardamomum is fragrant, and is capable of removing dampness, removing qi stagnation and adjusting middle jiao, smoothing spleen and stomach, and dredging middle jiao; semen coicis is capable of resolving dampness and clearing heat, tonifying spleen, dredging lower jiao, promoting releasing of dampness-heat via urinating, and promoting releasing; talc powder, ricepaperplant pith, and bamboo leaf are sweet, cold, and tasteless, are capable of clearing dampness and promoting dieresis, resolving dampness and clearing heat, dredging lower jiao, and helping to release dampness; rhizoma pinelliae is capable of eliminating dampness and harmonizing stomach, controlling nausea and vomiting, and eliminating qi-stagnating flatulence; mangnolia officinalis is capable of promoting the circulation of qi, and resolving dampness; the walnut oil are capable of clearing heat and expelling dampness, and is suitable for patients with rheumatism bone pain, superficial gastritis, antral gastritis, Acute and chronic colitis, jejunotyphoid, icterohepatitis, arthrophlogosis, and nephropyelitis to eat.