Biological strain screening and culture immobilization device and method, and application thereof

The invention discloses a biological strain screening and culture immobilization device and method, and application thereof. The biological strain screening and culture immobilization device comprises a pretreater, a treatment reactor, a culture chamber and an immobilization device, wherein the pretreater comprises a treatment component for removing impurities in sewage or sludge, an impurity discharge port and a bacterium-containing liquid discharge port; the treatment reactor communicates with the bacterium-containing liquid discharge port of the pretreater, and comprises an AR1 chamber for culturing facultative nitrobacteria, an AR2 chamber for culturing facultative carbonizing bacteria, a strain separation discharge pipe and a sludge discharge chamber; the culture chamber communicates with a strain separation discharge pipe of the treatment reactor, and is provided with a microorganism culture medium inside; and the immobilization device is used for concentrating and immobilizing the strain cultured by th