The utility model relates to the technical field of bubble generators, and discloses a micro-nano bubble generator which comprises a generator body, a liquid inlet
pipe is fixedly sleeved with the interior of the left side of the generator body, and a liquid outlet
pipe is fixedly sleeved with the interior of the right side of the generator body; and the connecting mechanism is designed on the outer surface of the liquid outlet
pipe. According to the micro-nano bubble generator, a brand new connecting structure design is adopted, the complex and tedious mounting and dismounting process of traditional threaded connection and
flange connection is abandoned, the mounting and dismounting time is greatly saved, the labor cost and the
time cost of equipment maintenance are remarkably reduced, and through ingenious combination of the connecting mechanisms, the production efficiency is improved. According to the micro-nano bubble generator, the risk that the connecting part is loosened is avoided, the stability of connection between the generator body and the external air floatation tank is ensured, micro-nano bubbles generated by the generator body can be smoothly conveyed into the air floatation tank, and it is ensured that the amount of the bubbles entering the air floatation tank is sufficient and stable.