Tunnel pneumatic drill fixing device

The utility model discloses a tunnel hand air drill fixing device which comprises an arm beam with the end capable of being fixed to a trolley in the using process, and a through hole for a hand air drill to penetrate through for supporting is formed in the middle of the arm beam. The telescopic part is fixed with the other end of the arm beam; when in use, the telescopic piece abuts against a contact pressing plate fixed in the inner wall face of the tunnel, and the contact pressing plate is fixed to the end of the telescopic piece. The two drill fixing petals on the arm beam relatively displace to fixedly mount and support different pneumatic drills, two ends of the arm beam are correspondingly fixed on a trolley and the inner wall surface of a tunnel, so that the two ends of the arm beam for supporting the pneumatic drills are stably supported, and the problem that the stability is insufficient when only one end of an arc-shaped rod for mounting a drilling machine is stressed and supported for construction