Abstract: Graphene oxide (GO) is a photothermal conversion material with good performance, which is widely used in seawater desalination, photoelectric conversion and solar energy utilization. In order to test the photothermal evaporation characteristics of GO supported non-woven fabric film (GO film) and polyvinyl alcohol-graphene oxide non-woven fabric composite film (PVA-GO composite film), GO was prepared by an improved Hummers method, and non-woven fabrics of cellulose and polyester were selected, and GO membranes and PVA-GO composite membranes were prepared by immersion-ultrasonic method. Ultraviolet-visible-near infrared spectrometer was used to analyze the light absorption properties of GO film and PVA-GO composite film, and the amount of evaporated water of GO film and PVA-GO composite film was measured by electronic balance. Because PVA has hydrophilicity and increases the water absorption of the membrane, the addition of PVA will increase the amount of evaporated water. The surface characteristics of GO membrane and PVA-GO composite membrane were analyzed by SEM. It is found that the GO membrane without PVA has a fibrous filament structure, and the fibers are clearly visible. After adding PVA, the fiber is wrapped by PVA, indicating that the light absorption capacity of the film is enhanced. When 6wt% PVA is added, the non-woven fibers are completely wrapped by PVA. When using a xenon lamp to conduct water evaporation experiments on the two films, the evaporation rate of the GO film reaches 1.67 kg/(m²·h), and the evaporation rate of the PVA-GO composite film reaches 1.85 kg/(m²·h). In addition, the layered structure of GO appears in the GO film, and the ultraviolet-visible-near-infrared spectroscopy shows a good light absorption ability, and it has a good photothermal conversion ability in the photothermal evaporation experiment. The PVA-GO composite film has better photothermal conversion performance and light absorption when the PVA mass concentration is 4wt%.