Anti-oil-leakage retarder of pumping unit and using method

The invention discloses an anti-oil-leakage retarder of a pumping unit and a using method. The anti-oil-leakage retarder of the pumping unit comprises a case base, a case cover, a driving shaft bearing cover, a driving shaft bearing, a bushing driving shaft, a left-hand helical gear, an intermediate shaft, a right-hand helical gear, an intermediate bearing cover, an intermediate shaft bearing, a driven shaft bearing, a driven shaft bearing cover, a driven shaft, a driven gear, O-shaped sealing rings, oil drain plugs, an inspection port pad and an inspection port cover. Firstly, aiming at oil leakage of a bearing end cover, the bearing end cover is subjected to multistage sealing; in addition, the manner of oil inpouring from the outer side of an original bearing is changed into the manner of oil inpouring from the inner side of the bearing; the friction of gears can generate heat, and two umbrella-shaped breather valves are added, so that the atmospheric pressure in a reduction case is reduced, the ventilatio