Built-in denitrification fluidization device

The invention provides a built-in denitrification fluidization device, and belongs to the field of sewage treatment, the built-in denitrification fluidization device comprises at least one denitrification fluidization device body, the diagonal position of the denitrification fluidization device body is provided with a first gap and a second gap; the horizontal partition plate assembly comprises a first horizontal partition plate and a second horizontal partition plate which are arranged in parallel, air holes are formed in the first horizontal partition plate and the second horizontal partition plate, and the first horizontal partition plate is located at the first notch; the vertical partition plate assembly comprises a first vertical partition plate and a second vertical partition plate which are arranged in a staggered mode. The first vertical partition plate, the first horizontal partition plate, the second horizontal partition plate and one inner wall of the denitrification fluidization device body form