The invention relates to a plaster for treating lumbar and belongs to a pure Chinese medicinal preparation. The plaster comprises the following components in part by weight: 1 to 5 parts of common monkshood mother root, 1 to 5 parts of kusnezoff monkshood root, 1 to 5 parts of heracleum, 1 to 5 parts of dahurian angelica root, 1 to 5 parts of rhubarb, 1 to 5 parts of largehead atractylodes rhizome, 1 to 5 parts of Chinese angelica, 1 to 5 parts of achyranthe bidentatae, 1 to 5 parts of eucommia bark, 1 to 5 parts of suberect spatholobus stem, 1 to 5 parts of Chinese loive, 1 to 5 parts of radix gentianae macrophyllae, 1 to 5 parts of pangolin scales, 1 to 5 parts of atraotydin, 1 to 5 parts of officinal magnolia bark, 1 to 5 parts of cassia bark, 1 to 5 parts of liquoric root, 400 to 600 parts of pure soybean oil and appropriate amount of processed galenite. The manufacturing method comprises the following steps of: soaking the above components into the pure soybean oil; putting the medicaments into a sandy pot after soaking for enough days; decocting the medicaments over slow fire until the medicaments dry, and filtering out gruffs to prepare medicinal oil, mixing the medicinal oil and the processed galenite, decocting the mixture over slow fire; stirring the mixture until the mixture becomes sticky; dropping the mixture into water to become beads; collecting the beads into a porcelain container; and soaking the porcelain container into cold water for later use. The plaster has the effects of activating blood, freeing channels and network vessels, dispersing swelling and relieving pain. The plaster can be directly pasted on affected parts to make the medicament directly reach focus. The plaster has the advantages of consolidated effective rate, quick response, short treatment period, no side effect and convenient use. Clinical application proves that the plaster has the effective rate of 97.9 percent, significant efficiency of 95 percent and cure rate of 83.6 percent.