Abstract: An apparatus for quickly making multiple-phase microemulsion fuel including: a primary mixer for primarily mixing water, catalyst, emulsifying agent, stabilizer and little quantity of oil in the primary mixer for producing oil-in-water phase mixing liquid; and a secondary mixer having a turbine agitator rotatably mounted in the secondary mixer, an eddy-flow guiding device of calabash shape disposed around the turbine agitator for producing upwardly and downwardly curved eddy flows of a mixing solution in the secondary mixer fed with the mixing liquid supplied from the primary mixer and raw fuel oil, and a plurality of turbulence baffles radially secured in the secondary mixer for limiting the eddy flows of the mixing solution in the secondary mixer into a plurality of eddy-flow "sector zones" for accelerating a thorough mixing and emulsion of the fuel oil with the oil-in-water phase mixing liquid for quickly producing water-in-oil phase fuel oil for better combustion efficiency and less air pollution when bur