The invention discloses a multi-function ultra-high voltage oil-filled power equipment full-sealing quantitative sampling device. The multi-function ultra-high voltage oil-filled power equipment full-sealing quantitative sampling device comprises a supporting frame and an injector; a three-way valve, a four-way valve and an oil collecting pipe are respectively arranged at upper ends of the supporting frame; the oil collecting pipe is connected with one nozzle of the four-way valve; the three-way valve and the four-way valve are mutually communicated through communication pipes; a waste oil cabin and the injector are respectively fixed on the supporting frame; an oil inlet of the waste oil cabin is communicated with one nozzle of the three-way valve; the lower end of the waste oil cabin is provided with an oil discharging valve; a liquid inlet of the injector is communicated with one nozzle of the four-way valve; a magnet base and a positioning bar are arranged on the supporting frame. The multi-function ultra-high voltage oil-filled power equipment full-sealing quantitative sampling device can replace manually site sampling achieved through the injector, effectively improves the working efficiency of full-sealing quantitative sampling, avoids repeat sampling, can be popularized to full-sealing sampling of equipment such as a transformer, satisfies various rules of the full-sealing sampling and meanwhile avoids environment pollution.