The invention discloses a micro-nano bubble
oxygenation device for a land-based circular culture pond. The micro-nano bubble
oxygenation device comprises an outer cylinder, a
cavitation cylinder, an air inlet
nozzle, a first screen, a connecting cylinder, an end cover and a
second screen, an opening is formed in the left end of the outer cylinder and serves as a water inlet; an end cover is mounted at the right end of the outer cylinder, and an opening is formed in the middle of the end cover and serves as a water outlet; the
cavitation cylinder is mounted at the left end in the outer cylinder, and the connecting cylinder is mounted at the right end; the left end of the
cavitation cylinder is provided with an air inlet
nozzle, the middle is provided with a cavitation water inlet, and the right end is connected with the connecting cylinder; the left end of the connecting cylinder is connected with the cavitation cylinder, and the right end is connected with the end cover; the first screen is mounted on a water inlet in the left end of the outer cylinder; and the
second screen is mounted on a water outlet in the middle of the end cover. According to the invention, the outflow state of
water flow and bubbles can be effectively controlled, and stable
water flow rich in
oxygen is provided for the culture pond.