To provide an oxygen-enriched water generator capable of being used in many fields, by solving the following problems: in the conventional oxygen bubble generators, simple generators generate many micro-size bubbles, so that oxygen cannot stay in water for a long time, and many nano-size bubble generators have a large and complicated structure.

When oxygen is introduced into water by using SPG with nano-size pores, 400-500 nanometer bubbles occupy the majority, so that the bubbles stay in water for a long time and high dissolved oxygen concentration is maintained for a long time. The SPG-incorporated generator is simple and compact, which enables use in many industrial fields.