The invention relates to a mixed wall of a flexible direct current valve hall building. The mixed wall is characterized in that a concrete block wall body, multiple steel purlins and a single-layer profiled steel sheet are included; the concrete block wall body is an outer wall body and is arranged on one side of the outdoors, the single-layer profiled steel sheet is an inner wall body and is arranged indoors, the single-layer profiled steel sheet and the concrete block wall body are connected into a whole through the steel purlins, and multiple gaps are formed between the single-layer profiled steel sheet and the concrete block wall body. According to the mixed wall of the flexible direct current valve hall building, the construction is convenient while the high cleanliness and the high electric shielding effect can be guaranteed, and the good durability, corrosion resistance and wind load resistance of the wall are also guaranteed; the mixed wall can be widely applied to building sites such as flexible direct current valve halls which need the high cleanliness and the high-quality electric shielding function.