The utility model relates to a coal mine equipment appurtenance, concretely relates to rotatory bottom plate of puffer, including the steel sheet, the bottom surface of steel sheet is connected with the chassis, and four angles of steel sheet are equallyd divide and have do not been seted up the through -hole, still set up a circular fixing hole and the three arc -shaped sliding chute who link upthe steel sheet on the steel sheet, and three arc -shaped sliding chute is first sliding tray, second sliding tray, third sliding tray respectively, fixing hole is unanimous with the contained angle at three arc -shaped sliding chute both ends to fixing hole slides on rotatory bottom plate for the three arc -shaped sliding chute of fixed pivot cooperation can make the puffer, the utility model discloses rotatory bottom plate of puffer's whole reasonable in design, simple structure, the operability is good, simple to operate, need not surely adorn once more when making two winch services have the contained angle sump, only do the rotation and just can accomplish, work load has significantly reduced.