With the emphasis on environmental protection, the development and utilization of solar energy has become the focus of current research, and the development of latent heat storage technology based on phase change materials (PCM) is one of the important measures to improve the development and utilization of solar energy. In this paper, MXene composites (PA/MXene) were prepared by melt blending method using two-dimensional transition metal carbide and/or carbon nitride (MXene) as the support skeleton and palmitic acid (PA) as the phase change material, and the composites with different Mxene additions were structurally characterized and thermally characterized. Compared with pure palmitic acid, the light absorption range of PA/MXene-20% [MXene mass fraction of 20% (based on the mass of PA/MXene composite)] is increased from 200-263.2 nm to 200-679.3 nm, the degradation temperature is increased by 13%, the thermal conductivity can be increased to 200%, and the photothermal conversion efficiency reaches 84.5%, which can realize integrated application of solar photothermal conversion and thermal energy storage.