To solve such a problem that molten metal temperature needs be raised during the use of a non-halogen flux for removing the oxide in the molten metal of an aluminum alloy.

The non-halogen flux for refining of the melt of aluminum or aluminum alloy includes a mixture composed of 10 to 70 wt.% of any of metal sulfate, alkaline metal sulfate or alkaline earth metal sulfate and 30 to 90 wt.% graphite.