The invention provides high-energy carbon alcohol clean fuel slurry and a preparation method thereof. The clean fuel is prepared from the following components in percentage by weight: 45-63 percent of pulverized coal which is over 300mesh and 37-55 percent of methanol, as well as, by total weight of the pulverized coal and methanol, 1-2 percent of a stabilizing agent, 1-3 percent of a dispersing agent, 0.1-0.3 percent of micron-metal powder, 0.1-0.2 percent of a catalyst, 0.5-1 percent of a desulfurizing agent, and a pH regulator which is used for regulating the pH value to 6.5-7.5. The clean fuel has the advantages of high combustion rate, high heat value, low cost and small emission of sulfur dioxide and nitrogen oxide, and can be widely applied to various boilers, diesel engines, gas turbines, tunnel type ceramic firing kilns, refractory brick down-draft kilns, hot-blast stoves of ceramic spray drying towers, rotary cement kilns, iron ore sintering machines and the like.