The present invention provides an oxygen generating device in a fish tank to supply oxygen necessary for fish and at the same time to sterilize, deodorize and purify ozone generated incidentally, thereby preventing the fish from rising and improving the hygienic environment of the water. The present invention relates to a domestic oxygen supply system.;In the conventional oxygen supply device for fishing, ozone-containing air is dispersed in a vapor phase through a bubble generator by forcibly injecting air into the ozone generator and a blower from outside, There is a problem that vibration occurs and oxygen supply is not sufficient.;The present invention is characterized in that at least one electrode is linear, or a thin plate or a porous formed plate having a net shape or a length different from each other is provided with a plurality of opposing electrodes and power is applied to the opposing electrode,
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