NOVELTY - The forming method involves forming a polymer film on the surface of a nanotemplate and heating the surface of the polymer film in contact with the nanotemplate (S120). The vacuum state at the outside of the nanoholes of the nanotemplate is released before vacuum suctioning the surface of the polymer film contacting the nanotemplate inward the nanoholes to form nanostructures on the surface of the polymer film (S130). The polymer film is separated from the nanotemplate after the formation of the nanostructures (S140).    USE - Forming method for forming nanostructures on surface of polymer film. The polymer film is used for an optical film, an electronic display film, a solar cell, a biosensor, and a functional clothing fabric. Can also be used in various industries to produce high functional and values substances.    ADVANTAGE - Enables quickly and easily forming nanostructures on the surface of the polymer film. Enables using the surface-modified polymer film having various special properties as a polymer substance. Various nanostructures can be formed by easily controlling the length of the nanostructures formed on the surface of the polymer film. Enables use of various thermoplastic polymer materials. Improves productivity and lowers production cost since processing time is shortened.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows the block flowchart of the method for forming nanostructures on the surface of a polymer film by vacuum suctioning.    Nanotemplate preparation process (S110)    Forming a polymer film on the surface of a nanotemplate and heating the surface of the polymer film in contact with the nanotemplate (S120)    Vacuum state at the outside of the nanoholes of the nanotemplate is released before vacuum suctioning the surface of the polymer film contacting the nanotemplate inward the nanoholes to form nanostructures on the surface of the polymer film (S130)    Polymer film is separated from the nanotemplate after the formation of the nanostructures (S140)