The utility model relates to a safety gate device of an axle box type lifter. The safety gate device comprises rotating shafts, sliding contact blocks, trigger plates and gate plates. The interval between two first stand columns in the axle box type lifter serves as a passageway for conveying goods for an axle box. The opposite faces of the two first stand columns are connected with the rotating shafts in a rotating mode respectively. The two rotating shafts are parallel to each other and both perpendicular to the stand columns. The end, facing towards the axle box, of each rotating shaft is fixedly connected with the corresponding sliding contact block. The other end of each rotating shaft is fixedly connected with the corresponding gate plate. The passageway can be kept in the opened state or the closed state through the two gate plates due to rotation of the rotating shafts. The two trigger plates are arranged on side faces of the axle box respectively and can trigger the sliding blocks to rotate so as to drive the rotating shafts to rotate. Potential safety hazards caused by abnormity of a photoelectrical detection system can be avoided through the safety gate device.