The utility model relates to a simple oil sample valve for an oil-immersed distributing transformer. The utility model is arranged on a closing plate of an oil drain valve of an oil-immersed distributing transformer. The utility model comprises a valve seat, a screw bolt plug and an annular sealing gasket, wherein, the inner part of the valve seat is provided with a shaft hole, wherein, the front part of which is provided with a wide hole, and the back part of which is provided with a narrow hole. The shaft hole forms a staircase shape. An inner screw thread is arranged on the wall surface of the wide hole. An inclined hole is arranged on the lower wall surface at the depth of the wide hole. The end part of the screw bolt plug is provided with a neck shaft, and an outer screw thread is arranged on a screw post of the screw bolt plug. The annular sealing gasket is sheathed on the neck shaft of the screw bolt plug. Because the oil drain valve is closed in normal times, oil pressure in a transformer box can not act on the oil sample valve, and therefore, oil can not leak. When an oil sample is taken, an oil flow is injected into an oil sample bottle from the inclined hole at the lower part of the oil sample valve, which effectively controls the phenomenon that oil overflows. The utility model leads the oil drain valve to have the functions of the oil sample valve, a special oil sample valve on the transformer is cancelled, points of oil leakage are reduced, work hours and material consumption are reduced, and operation for taking an oil sample is simple and convenient.