The invention relates to an oil gas recycling system. The oil gas recycling system comprises a first adsorption tower, a second adsorption tower, a third adsorption tower, a fourth adsorption tower, a vacuum pump, a gas inlet pipeline, an exhaust pipeline and a regenerated gas pipeline, wherein the gas inlet pipeline comprises a gas inlet, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline which are respectively connected with inlets of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower, and a first switching pipeline; the exhaust pipeline comprises an exhaust hole, a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline which are respectively connected with outlets of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower, and a second switching pipeline, a third switching pipeline and a fourth switching pipeline; and the regenerated gas pipeline comprises a regenerated gas outlet, a ninth pipeline, a tenth pipeline, an eleven pipeline and a twelfth pipeline which are respectively connected with the inlets of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower, and a fifth switching pipeline. The oil gas recycling system has two operating modes, namely, a single-stage mode and a parallel mode, and can meet different oil gas treatment requirements, one vacuum pump is adopted under the two operating modes, the equipment input is reduced, the energy consumption is reduced, the oil gas recycling effect is good, and the efficiency is high.