The invention provides a leakage stoppage material for a coal vehicle and a preparation method thereof. The leakage stoppage material comprises an adhesive component, a leakage stoppage framework component, and a curing component, wherein the leakage stoppage framework component contains coal powder, the curing component contains quick-setting cement, and the adhesive component contains carboxymethyl cellulose and water. The leakage stoppage material comprises components by weight percentage: 10 to 20 weight percent of quick-setting cement, 30 to 50 weight percent of coal powder, and 40 to 50weight percent of adhesive, wherein the content of the carboxymethyl cellulose in the adhesive component is between 4 and 9 weight percent. The leakage stoppage material has a simple preparation process, excellent adhesion performance, and convenient site operation.