The invention relates to a high-efficient closed energy-saving environment-friendly cleaning tanker of oil well tubing and a cleaning method. The high-efficient closed energy-saving environment-friendly cleaning tanker comprises a car body and a device platform arranged on a chassis of the car body, wherein the device platform is provided with a heat source heat supply assembly, a water source supplying and recycling assembly and an automatic control system assembly, the heat source heat supply assembly comprises a boiler, a burner connected with the boiler, a diesel tank connected with the burner and used for providing fuel, and a filter connected with the diesel tank; the water source supplying and recycling assembly comprises a water supply tank, a flexible cleaning pipe, a winding machine, a cleaning tube pump, a three-cylinder plunger pump, a re-filling pump and a recycling tank; and the automatic control system assembly comprises a waterproof control cabinet. The high-efficient closed energy-saving environment-friendly cleaning tanker has the advantages that the structure is simple, the design is reasonable, the automation degree is high, the operation and application are convenient, the operation efficiency of on-site operation workers is high, the maintenance cost is low, the running is safe and reliable, the energy-saving emission-reducing requirement of the state can be met, and the like.