The invention provides a hole repairing construction machine for a polyethylene anti corrosive coating of a metallic tube and a construction method thereof. A main body of the hole repairing construction machine consists of a tubular pressurizing sleeve and a tubular rubber air bag adhered to the inner wall of the main body; and the pressurizing sleeve and the rubber air bag are kept coaxial with the tube by four support arms arranged on each of the two sides of the pressurizing sleeve along the axial direction of the tube and rubber rolling wheels arranged at the tail ends of the pressurizing sleeve, and a polyethylene hole repairing band is artificially inserted in the pressurizing sleeve from the side of longer support arms and closely attached to the inner wall of the rubber air bag by the recurrent force of the polyethylene hole repairing band. The polyethylene hole repairing band may be of an electric heating fusion shrinking type or external heating shrinking type, the rubber air bag is pressurized by air compression equipment and a thermal conduction oil pump, and after the polyethylene hole repairing band is electrified for heating fusion or fused by the heat transfer of the thermal conduction oil, the rubber air bag is gradually pressurized to 0.01 to 1Mpa until the adhesion is completed. In the hole repairing process of the invention, main operational steps are automatically completed by the equipment, and the construction quality is good; and the polyethylene hole repairing band withstands a huge pressure in a softening process, so that the bonding strength is greatly improved, and the cost is also low.