Air duct for coal mine

The utility model relates to the technical field of coal mine air ducts, in particular to an air duct for a coal mine, which comprises a first air duct, and a filter screen is arranged at the near-air end of the first air duct. A group of arc-shaped plates are fixedly connected to the outer side, close to the air end, of the first air duct; arc-shaped grooves are formed in the arc-shaped plates; a through opening is formed in the front side of one end of each arc-shaped groove; a set of first springs are fixedly connected to the side, close to the first air duct, in each arc-shaped groove. The other ends of the first springs in each set are jointly and fixedly connected with an arc-shaped pressing plate. The two ends of the filter screen are fixedly connected with connecting plates; clamping plates are fixedly connected to the front ends of the connecting plates; by pressing the filter screen, the clamping column is separated from the first round hole in the clamping plate, then the filter screen is rotated,