The utility model discloses an insulation paper aging test device of a power transformer. The device comprises a machine body, an insulating paper support arranged on the machine body, an oil tank and a temperature control device. Transformer oil is contained in the oil tank, and the upper side of the oil tank is provided with a sampling opening and an inlet allowing the insulating paper support to extend into the oil tank; multiple heating temperature control points are evenly distributed on the outer surface of the insulating paper support; each heating temperature control point comprises a ceramic plate, a heating resistor and a metal heat conductive piece used for simulating a transformer conductive coil, and the ceramic plates are evenly distributed on the outer surface of the insulating paper support; the heating resistors are arranged between the ceramic plates and the metal heat conductive pieces and are connected with the temperature control device through wires; the outer surfaces of the metal heat conductive pieces are further provided with insulating paper wrapping the insulating paper support. By means of the insulation paper aging test device, uninterruptible power sampling of the transformer oil can be achieved, online observation and detection can be achieved, and the mathematic relation between the aging degree of the insulating paper and the content of a soluble aged product can be conveniently analyzed; besides, independent temperature control of the heating temperature control points can be achieved, and temperature control precision is high.