The invention discloses a non-contact continuous biological dealkalization technology for red mud. The technology comprises the following steps: injecting sterilized culture medium subjected to dealkalization strain inoculation into an acid production filtering tank, setting parameters at a starting stage, entering a continuous acid production state after the starting stage is operated for certaintime, adopting continuous liquor charging and continuous liquor discharging modes, ensuring that aspergillus niger is fermented to produce acid in the acid production filtering tank, conveying produced fermentation liquor into a dealkalization tank, ensuring that mycelium pellets are singly discharged, and red mud slurry and fermentation liquor are subjected to acid-base neutralization reaction,so as to reduce the basicity of the red mud, feeding a reacted mixed material into a solid-liquid separation tank, and ensuring that dealkalization liquor and the red mud subjected to dealkalization are both neutral and can be directly discharged or recycled. The technology has the advantages that red mud does not in direct contact with mycelium, the negative effect on the growth and reproductionof the mycelium by the venensity of red mud is avoided, continuous operation ensures that strain is always in a logarithmic phase, the negative effect caused by the lag phase and decline phase of thallus is avoided, and efficient, green and low-cost running of biological dealkalization technology for red mud is realized.