Air leakage prevention device for coal mine

The utility model relates to an air leakage prevention device for a coal mine, which is characterized in that folio turnover plates are arranged in centered positions in a support body, and torsion springs connected with the turnover plates to form wholes are arranged in positions of the turnover plates, which are close to the support body. By using the air leakage prevention device for the coal mine, which is disclosed by the utility model, the work environment can be well improved, the mine ventilation quality can be increased, the occurrence of air leakage phenomena of a funnel is fundamentally and completely eradicated, a negative pressure effect is avoided, the occurrence of gas accidents is reduced, and the occurrence of reentrainment of pulverized coal at a funnel opening is reduced at the same time, so a good work environment is created for safety production of the mine. The air leakage prevention device for the coal mine has a simple structure, is convenient to manufacture, maintain and replace, and