The utility model discloses a corner sectorial sampling valve for a charged oil sampling device of a transformer oil impregnated bushing. The corner sectorial sampling valve comprises a main body, an oil outlet pipe, a connecting pipe and a handle, wherein the oil outlet pipe and the main body form a plunger and barrel assembly, and the handle and the main body form a plunger and barrel assembly; the connecting pipe is connected inside the main body in a rotating manner, and is engaged with the gear of the handle; the oil outlet pipe is in butt joint and communication with the connecting pipe; a first end cap is arranged at one end, in butt joint with the connecting pipe, of the oil outlet pipe, and comprises a first seal area and a first hollow area; a second end cap is arranged at one end, in butt joint with the oil outlet pipe, of the connecting pipe, and comprises a second seal area and a second hollow area. The corner sectorial sampling valve for the charged oil sampling device of a transformer oil impregnated bushing is good in sealing effect and high in reliability, cannot easily leak, is available in flow regulation, convenient and safe to operate, and is suitable for wide assembly and application of charged oil sampling devices of transformer oil impregnated bushings in the electrical power system.