Telescopic air duct for coal mine driving face

The utility model provides a telescopic air duct for a coal mine driving working face, which comprises a negative pressure air duct, a telescopic frame body and a fixing mechanism, and the fixing mechanism comprises a vertical sliding chute and a sliding block positioned in the sliding chute; the telescopic frame body comprises a plurality of sections of X-shaped supports, the upper ends and the lower ends of every two adjacent sections of X-shaped supports are correspondingly hinged, the overlapping positions of two supporting rods of each section of X-shaped support are hinged, one end of the X-shaped support at the head end is fixed in the sliding groove, and the other end of the X-shaped support at the head end is fixed to the sliding block. A steel ring is arranged in the negative pressure air duct, and the tops of every two adjacent sections of X-shaped supports are connected with the top end of one steel ring. The telescopic air duct solves the problem that the telescopic air duct for the coal mine hea