The invention discloses a plunger for air lifting. The plunger for air lifting comprises a hollow tubular base cylinder, an upper cover plate, a lower cover plate, a corrugated pipe and a movable column. The base cylinder is provided with an upper end opening and a lower end opening which are back to each other; air flow holes are formed in the cylinder wall of the base cylinder; and the base cylinder is internally filled with preset air. The upper cover plate is arranged on the upper end opening of the base cylinder. The lower cover plate is arranged on the lower end opening of the base cylinder, and an opening is formed in the lower cover plate. The base cylinder is sleeved with the corrugated pipe, and the two ends of the corrugated pipe are in sealing connection with the upper cover plate and the lower cover plate correspondingly. The movable column penetrates through the opening and is slidably arranged in the base cylinder. When the movable column moves close to the upper cover plate, the preset air is compressed, and meanwhile the radial size of the corrugated pipe is increased. According to the plunger for air lifting, the defects of an existing plunger can be overcome, during using, the sealing effect is good, the falling speed is high, the diameter of an oil tube can be changed through deformation of the plunger, the overall working efficiency is high, and applicability is wide.