▎ 摘　　要

NOVELTY - Preparing photo thermal conversion film with controllable thickness of graphene layer comprises (i) paving the microporous polyether sulfone film on the polyethylene film, using carbon dioxide laser to irradiate the microporous polyether sulfone film to completely graphite alkene to obtain composite film with a layer of graphene, (ii) continuing flatly spread the microporous polyether sulfone film on the composite film, using the same carbon dioxide laser to irradiate the microporous polyether sulfone film to obtain the composite film with two layers of graphene, and (iii) repeating the operation to obtain the composite film with the needed thickness of the graphene layer, spreading the composite film flatly polyethylene film for hot pressing to obtain photo-thermal conversion film. USE - The photo thermal conversion film is useful for cold and alpine regions, arid and semi-arid areas, and low-heat and plain areas in different areas (all claimed). ADVANTAGE - The photo thermal conversion film production speed is fast, the preparation area is large and economical. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: photo thermal conversion film with controllable thickness of graphene layer, obtained by the above- mentioned method; and use of photo thermal conversion film with controllable thickness of graphene layer in different areas, preferably using photo thermal conversion film with a graphene layer thickness of 600 μm-1mm in cold and alpine regions; using photo thermal conversion film with a graphene layer thickness of 100-200 μm in arid and semi-arid areas, and using photo thermal conversion film with a graphene layer thickness of 300-500 μm in low-heat and plain areas. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of preparing photo thermal conversion film with controllable thickness of graphene layer (Drawing includes non-English language text).