The invention discloses a pressure pipeline welding method. The method comprises the steps that a wall thickness measuring module measures the wall thickness of a pipeline and sends the wall thickness to a wall thickness management unit; a radio frequency identification unit reads a radio frequency tag and then sends pipeline information to a pipeline management unit; the pipeline management unit acquires and matches the pipeline information; the wall thickness management unit matches a welding mode; an infrared thermal imaging device collects thermal imaging information and then sends the thermal imaging information to an image processing unit; the image processing unit analyzes the thermal imaging information and receives welding evaluating information; and a database obtains the welding evaluating information and then acquires preset welding parameters associated with pipeline serial numbers. According to the pressure pipeline welding method disclosed by the invention, the pipeline information is loaded into the radio frequency tag, the wall thickness information is collected to be matched with pipeline welding, meanwhile, the welding information is collected in an infrared mode during welding, different welding requirements are met, the system is convenient to use and complete, the labor working loads are decreased, and assistance is provided for pipeline welding operation.