The invention provides a reactor suitable for surface nano array filler and an application thereof. By growing a hydrophilic surface layer which comprises micro/nanoscale bumps first on the surface ofthe filler, the specific surface area of the filler is improved greatly, and then by enhancing the wettability of the filler, a liquid is extremely easily paved on the surface of the filler, so thatthe gas-liquid reaction rate is improved. The micro/nanoscale bumps have a certain liquid retaining ability, and the catalytic active components on the surface of the liquid, gas and an array are in full contact, so that the retaining time of reactants on the filler is prolonged and the catalytic reaction rate is increased greatly.