The invention discloses a current acquisition unit fixing case for a voltage transformer direct current magnetic bias monitoring device. The current acquisition unit fixing case comprises a case body front cover and a case body back cover, and joint parts of the two cover bodies are both provided with rectangular connecting frames which are uniformly provided with a plurality of connection holes. The outer surface of one side of the back cover of the case body is connected with a clamp set on a pillar, and the inner surface is connected with an open-close mutual inductor. A grounding bar is arranged in a groove of the open-close mutual inductor in a penetrating mode, and the rectangular connecting frame is provided with a notch matched with the grounding bar. A heater is connected to the inner surface of one side of case body front cover, and the horizontal position of the upper end face of the heater is lower than the horizontal position of the lower end surface of the open-close inductor. The current acquisition unit fixing case of the invention adopts the open-close inductor, and is convenient to install and maintain; the grounding bar does not need to be broken; influence on system safety does not exist; the front cover of the case body is equipped with the heater to support low temperature applications; and the current acquisition unit fixing case is reasonable in design, and satisfies installation demands by direct current acquisition units in the voltage transformer direct current magnetic bias monitoring device.