The invention discloses a pipeline moving and modifying engineering oil recovering system, and belongs to the technical field of oil pipeline moving and modifying engineering oil recovering. The system comprises a relocation new pipeline, a relocation old pipeline, a nitrogen car, a quick open ball serving barrel, a combination ball, an oil recovering pressure-rise control device, a quick open ball serving barrel and a plugging machine. According to the system, nitrogen injected through the nitrogen car and a high-pressure oil pump serve as power sources, the nitrogen pushes the combination ball to advance, the combination ball pushes oil in the relocation old pipeline to flow into the oil recovering pressure-rise control device, and the oil is injected into the new pipe through the high-pressure oil pump in an accelerated manner; and the defects that potential safety hazards of high-point air inlet and low-point oil extraction are many, the risk is large, the recovering period is long, cost is high, and the oil quality cannot be guaranteed.