The invention discloses a digestive tract contrast agent capable of relieving gastrointestinal convulsion and having hypotonic effect, which is prepared from 50-70 weight parts of barium sulfate dry suspension or compound cardiografin contrast agent and 20-30 weight parts of traditional Chinese medicinal extract. The traditional Chinese medicinal extract is prepared by mixing the following raw materials in parts by weight: 20-30 parts of Corydalis yanhusuo, 10-20 parts of Radix Bupleuri, 20-30 parts of processed Radix Glycyrrhizae, 20-30 parts of Salvia miltiorrhiza, 10-20 parts of Cyperus rotundus, 10-20 parts of Aucklandia lappa, 20-30 parts of Fructus Amomi, 20-30 parts of Evodia rutaecarpa, 10-20 parts of Rhizoma Coptidis, 10-20 parts of Radix Paeoniae Alba, 20-30 parts of Atractylodes macrocephala, 5-10 parts of Radix Codonopsis, 10-20 parts of Bletilla striata, and 5-15 parts of Panax pseudoginseng powder, soaking in water, decocting for 30-40 min, filtering to obtain a filtrate, concentrating the filtrate under reduced pressure, and freeze-drying. The digestive tract contrast agent disclosed by the invention has low adverse side effects and gastrointestinal imaging function, can relieve gastrointestinal convulsion to achieve clinically desired hypotonic effect, and has important value for imaging diagnosis of early gastrointestinal lesions. The digestive tract contrast agent has effects of relieving pain and swelling, dissipating blood stasis, stopping blooding, improving gastrointestinal mucosa microcirculation, promoting gastrointestinal fluid absorption, relieving cardiac ache and gastrointestinal convulsion, and nourishing and treating stomach, intestine, liver, spleen and other organs.