An aromatic nebulizing diffuser formed of a bottom holder shell, an electric fan, a mist creation block member, an oscillator, a circuit board, a power supply unit and a cover shell assembly is disclosed. The oscillator is adapted to oscillate an aromatic fluid in the mist creation block member into a mist of aromatic fluid droplets. The mist creation block member includes a semispherical air guide and a top flange, defining an air passage for guiding fan-induced currents of air to the nozzle hole of the cover shell assembly. The cover shell assembly defines a fluid storage chamber for providing a refill to the oscillation chamber, and a water stopper to prevent splashing.
