The utility model relates to a petroleum production aid, which is composed of a ground control box and an underground heating magnetizing tube. The magnetizing tube comprises a heat transferring inner tube, the wall of which is provided with an oil collecting hole, an insulating supporting frame sheathed on the outer diameter of the heat transferring inner tube, an electromagnetic copper tube coil, the inner part of which is provided with electric conduction liquid and which is arranged on the tube wall of the insulating supporting frame, a sealing casing tube, the inner part of which is filled with insulating heat transferring oil, a permanent magnet steel ring fixed on the outer diameter of the lower end of the heat transferring inner tube, a sensor cover, the inner part of which is provided with a frequency-changing device, and a flow and temperature sensor. The utility model has the advantages of energy saving, high thermal efficiency, crude petroleum magnetization, wax precipitation prevention, low cost, safety, simple operation, etc., and the shifting sand is prevented from preventing wells to make the underground oil layers heated stably.