Abstract: The invention relates to a process for manufacturing emulsified fuels by using “oily water” that is proceeded by following steps: (1) preparing the “oily water” that has 0.02—30% (w/w) of combustible fuels dissolved in water and is blended with surfactants (or called as emulsifiers) by 0.01˜3% (w/w); (2) primarily mixing the emulsified “oily water with surfactants”, that was finished by step (1), with 60˜95% (w/w) of heavy fuel oil (abbreviation as heavy oil) or with 75˜98% (w/w) of diesel, respectively; and (3) keeping the mixtures that were finished by step (2), respectively, and mixed up further by using homogenizer to become an “oily water emulsified heavy oil” (OWEH) or an “oily water emulsified diesel” (OWED).