This study presents the development of transparent ultrahigh-molecular-weight polyethylene (UHMWPE)/MXene films with efficient UV absorption for thermal management. MXenes, known for their photothermal conversion efficiency, are often opaque, limiting their applications. The researchers successfully created a visible-light transparent and UV-absorbing polymer composite film by blending MXene with UHMWPE and then vacuum pressing. The resulting film maintains over 85% visible light transmittance and low haze (<12%) while absorbing 78% of UV light. The film can be quickly heated to 65 °C under 400 mW cm⁻² light irradiation. Indoor heat insulation tests showed that the temperature of a glass house model covered with this film was 6-7 °C lower than that of an uncovered model. EnergyPlus software simulations predicted that the film could reduce annual refrigeration energy consumption by 31-61 MJ m⁻² and 3%-12% of total energy used for refrigeration in such structures. This work highlights the potential of transparent MXene/UHMWPE films in energy-related applications, particularly in thermal management and energy savings.This study presents the development of transparent ultrahigh-molecular-weight polyethylene (UHMWPE)/MXene films with efficient UV absorption for thermal management. MXenes, known for their photothermal conversion efficiency, are often opaque, limiting their applications. The researchers successfully created a visible-light transparent and UV-absorbing polymer composite film by blending MXene with UHMWPE and then vacuum pressing. The resulting film maintains over 85% visible light transmittance and low haze (<12%) while absorbing 78% of UV light. The film can be quickly heated to 65 °C under 400 mW cm⁻² light irradiation. Indoor heat insulation tests showed that the temperature of a glass house model covered with this film was 6-7 °C lower than that of an uncovered model. EnergyPlus software simulations predicted that the film could reduce annual refrigeration energy consumption by 31-61 MJ m⁻² and 3%-12% of total energy used for refrigeration in such structures. This work highlights the potential of transparent MXene/UHMWPE films in energy-related applications, particularly in thermal management and energy savings.