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This work further investigates the heterogeneous alloyed PdPtCu nanoflower clusters (PdPtCu NVFs) mediated photo-Fenton and photothermal synergistic catalysis for dye elimination. [Display omitted] • Synthesized heterogeneous alloyed PdPtCu nanoflower clusters (PdPtCu NVFs) mediated photothermal and photo-Fenton synergistic catalysis for dye elimination. • Increased dye degradation by PdPtCu NVFs under NIR laser irradiation. • Reusable nano-catalyst has great potential for organic sewage treatment. This study primarily employed a one-step reduction method to synthesize palladium-platinum-copper nanovelvet flowers (PdPtCu NVFs). PdPtCu NVFs are multi-branched nanomaterials composed of nanosynapses that radiate in different directions. Their unique structure and incorporation of three metallic elements contribute to their outstanding Fenton catalytic vitality and photothermal performance. Characterizations for PdPtCu NVFs were conducted by using transmission electron microscope (TEM), electron paramagnetic resonance (ESR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) techniques. Under near-infrared light, PdPtCu NVFs rapidly reached a temperature of 50 °C. In comparison with conventional photocatalysts, PdPtCu NVFs demonstrated significantly enhanced degradation of organic dyes (methylene blue, MB) degrading due to their superior Fenton catalytic activity. Even after multiple reuse, PdPtCu NVFs still exhibited distinct nanosynapses, along with excellent photothermal stability and Fenton catalytic activity. These results indicate that PdPtCu NVFs possess excellent purifying capabilities for organic wastewater. [ABSTRACT FROM AUTHOR]