Method for repairing micro-arc oxide film oil leakage at seal groove of cylinder body of actuator cylinder of airplane

The invention discloses a method for repairing micro-arc oxide film oil leakage at a seal groove of a cylinder body of an actuator cylinder of an airplane. The method comprises the followings steps: disassembling the cylinder body of the actuator cylinder assembly of the airplane; measuring the surface roughness of the micro-arc oxide film at the seal groove of the cylinder body, if the surface roughness reaches Ra 1.6 or above, detecting whether a loose layer is generated on the micro-arc oxide film at the seal groove of the cylinder body or not, and if the loose layer is generated, conducting reparation: (1) wrapping the cylinder body with a layer of soft cloth, and clamping the cylinder body on a three jaw chuck of an electric polishing machine; (2) adsorbing a gauge head and a gauge stand of a dial indicator on the other side of the electric polishing machine, rotating the cylinder body, and keeping the jerk value of the seal groove of the cylinder body to be not more than 0.05; (3) enabling a felt wheel