The present invention relates to an oxygen supply device in an aquarium without scattering of fish feed and without fish stress, and to a chemical liquid supply device using the same, and specifically, to an oxygen supply device, which connects a circular nozzle to a nozzle connection part of an air pump and forms dozens of exhaust holes in the outer circumference of the nozzle to lower a discharge speed of air to be supplied so that fish playing therearound do not get stressed, and the feed lain on the sand is not scattered. The present invention also relates to the oxygen supply device for simultaneously supplying a chemical solution for treating parasites and scars of fish by providing a chemical solution supply part for supplying a necessary fish treatment agent to the nozzle part.;COPYRIGHT KIPO 2018
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