Disclosed is a coal dust preventing agent for coal mine yard which prevents scattering of yards by forming a skin of limestone with a predetermined thickness with a coagulation power of calcium oxide and prevents wash-down by water or mixing of water. As a technical task,;It is composed of 50-60% of calcium oxide, 20-25% of silicon dioxide, 4-10% of alumina, 0.9-4% of carbon, 0.92% of magnesium oxide, 01-1% of iron oxide, 0.1-1% of chromium trioxide, 1%, titanium oxide 0.1-1%, manganese oxide 0.09-0.51%, and phosphorus pentoxide 0.01-0.1%.;Provided is a dust preventant for preventing scattering and rainwater contact in a yard where there is a risk of scattering of open-air dust such as coal mine yard.
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