This study investigates the synthesis and multifunctional properties of Carbon Quantum Dots (CQDs) derived from Waltheria indica leaves using a microwave assisted method. The CQDs exhibited notable optical properties, including UV visible absorption peaks at 260-350 nm and excitation-dependent fluorescence emission. Fourier Transform Infrared Spectroscopy (FTIR) revealed the presence of -O-H, C=O, and -C≡C- functional groups. High Resolution Scanning Transmission Electron Microscopy (HRSTEM) confirmed a quasi-spherical morphology with a size distribution of 1.5–5.0 nm. The CQDs demonstrated significant antioxidant activity in the DPPH assay, with an IC50 value of 28.86 μg mL⁻¹. Photocatalytic degradation experiments showed that the CQDs effectively degraded methylene blue (MB) and eosin yellow (EY) under visible light, with degradation efficiencies increasing with higher CQD concentrations and longer exposure times. The study concludes that Waltheria indica-derived CQDs hold promise for environmental and biomedical applications due to their strong antioxidant and photocatalytic properties.