The invention relates to the field of medicament formulas, in particular to a thickleaf croton root and clematis root soup for treating lumbocrural pain. The thickleaf croton root, the clematis root, rosewood heart wood, East Asian tree fern rhizome, shinyleaf pricklyash root, twotooth achyranthes root, himalayan teasel root, turmeric, atraotydin, malaytea scurfpea fruit, red paeony root, ground beetle and coix seed serve as raw materials and are soaked in water, and the materials are decocted and residues are removed so as to obtain filtrate. The technical characteristics are that: the soup comprises the following raw materials in percentage by weight: 8 to 12 percent of the thickleaf croton root, 8 to 11 percent of the clematis root, 8 to 11 percent of the rosewood heart wood, 5 to 8 percent of the East Asian tree fern rhizome, 5 to 9 percent of the shinyleaf pricklyash root, 4 to 7 percent of the twotooth achyranthes root, 8 to 11 percent of the himalayan teasel root, 3 to 7 percent of the turmeric, 4 to 7 percent of the atraotydin, 3 to 6 percent of the malaytea scurfpea fruit, 6 to 9 percent of the red paeony root, 4 to 6 percent of the ground beetle and 8 to 13 percent of the coix seed. The soup is low in cost, has high curative effect of treating the lumbocrural pain, has no toxic or side effect, has the effects of clearing away heat and removing toxins, expelling wind and activating blood flow, excreting dampness to eliminate corrosion, tonifying qi and diminishing swelling and relieving pain, and is suitable for various lumbocrural pains.