Provided is a carbon nanostructure-metal composite nanoporous film in which a carbon nanostructure-metal composite is coated on one surface or both surfaces of a membrane support having micro- or nano-sized pores. A method for manufacturing a carbon nanostructure-metal composite nanoporous film, includes: dispersing a carbon nanostructure-metal composite in a solvent at the presence of a surfactant and coating the carbon nanostructure-metal composite on one surface or both surfaces of a membrane support; and fusing the metal on the membrane support by heating the coated membrane support. The metal in carbon nanostructure-metal composite nanoporous film melts at a low temperature since a size of a metal of the carbon nanostructure-metal composite is several nm to several-hundred nm.