The utility model discloses a pneumatic helping hand opening device of two accuses of mining air door, the helping hand source is moved to first control case, second control box, driving rope, the direction wheelset gentleness of setting on air door low tension side laneway's side including setting up on air door high -pressure side laneway's side, the first control incasement be equipped with anair source processor trigeminy piece and first tee bend butterfly valve for control pneumatic helping hand source admit air orientation and throughput, the second control box in be equipped with the 2nd air source processor trigeminy piece and second tee bend butterfly valve for control pneumatic helping hand source admit air orientation and throughput, the top of driving rope is fixed with air door high -pressure side door plant, and the end of driving rope passes the leading wheel group link in proper order and is able to help to outer tunnel, and pneumatic helping hand source is fixed outside the tunnel through fixing device and is able to help, just leads the wheelset setting on pneumatic helping hand source, utilize this device can be inside and outside the air door respectively control ventilation door open with closed labour saving and time saving, quick safety.