Graphene quantum dots (GQDs) are the one of carbon nanomaterials with a size smaller than 10 nm. Quantum dots (QDs) have attracted much attention due to their low toxicity, environmental friendliness and ease of synthesis, which have led to their application in various applications such as biological imaging and sensors. This research focuses on the use of humic acid (HA) as a precursor and EDA as a dopant using an electric deep fryer as a reactor. The results showed that GQDs having the maximum fluorescence intensity of 66 a.u at a wavelength of 467 nm (greenish blue light range) obtained at the humic acid to ethylenediamine ratio of 10:0.5 (mg:mL). The average particle size ranged from 6 to 10 nm observed by transmission electron microscopy (TEM) and particle size measurements, fluorescence spectra, and UV-Visible absorption techniques, respectively. The graphitic structure of GQDs was confirmed by Raman spectroscopy. In summary, this work successfully synthesized graphene quantum dots from low-cost and environmentally friendly materials. The results are consistent with the quantum dot theory, where the particle size is inversely proportional to the width of the band gap energy.