The invention provides a traditional Chinese medicine bathing preparation for treating eczema and a preparation method thereof, and belongs to the technical field of traditional Chinese medicine. Thetraditional Chinese medicine bathing preparation is prepared from the following raw materials: ramulus cinnamomi, Chinese mosla herb, white peony roots, smoked plum fruits, cicada slough, panicled swallowwort roots, broom cypress fruits, cortex dictamni radicis, raw baical skullcap roots, bamboo juice or raw caulis in taenias bambusae, fructus forsythiae, oldenlandia diffusa herb, climbing groundsel herb, purslane herb, saxifraga stolonifera herb, asiatic pennywort herb, winged euonymus twigs, cnidium fruits, raw licorice roots, unprocessed rehmannia roots and milkvetch roots. The preparationmethod of the traditional Chinese medicine bathing preparation comprises the following steps: (1) soaking the traditional Chinese medicine raw materials in normal-temperature water for 20-80min; and (2) performing decocting with strong fire to boil, then performing decocting with soft fire for 30 min and separating decoction; putting dregs of decoction in water, performing decocting with strong fire to boil, then performing decocting with soft fire for 20 min, separating decoction again, mixing the primary decoction with the secondary decoction to obtain the traditional Chinese medicine bathing preparation. The traditional Chinese medicine bathing preparation has high effect-taking speed when applied to acute, sub-acute and chronic wet type and hot type specific eczema.