A decorative lamp in tubular aquarium includes a tubular water container having water and a plurality of artificial fish therein, a base which is a hollow body for supporting the tubular water container, and a lid covered on the top of the tubular water container. The base comprises a lamp holder having a bulb therein for providing the lighting in the tubular water container, a glass tube receiving the lamp holder and transversally placed in the base for providing a color light in the tubular water container by a color of the glass tube, and an air bubble valve making air bubbles by a pump in the tubular water container to keep those artificial fish in the tubular water container moving.
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