A novel g-C3N4/BiVO4 microflower photocatalyst was synthesized via a modified hydrothermal method. The physicochemical properties of the g-C3N4/BiVO4 microflower photocatalyst were scrutinized via XRD, FESEM and DR-UV-Vis analysis. The performances of the g-C3N4/BiVO4 microflower photocatalyst were assessed through the photocatalytic degradation of amoxicillin antibiotic and the photoelectrocatalytic hydrogen production. It was found that the g-C3N4/BiVO4 microflower photocatalyst was capable of producing up to 14.35 mmol/h of hydrogen. Meanwhile, 89.5 of amoxicillin antibiotic was successfully degraded within 3 hours under visible-light-irradiation. The profound photocatalytic performances of the g- C3N4/BiVO4 microflower photocatalyst were attributed to the intimate contact between both photocatalyst, results in a smooth photocharge carrier separation and migration, evidently from the FESEM analysis. It is anticipated that this work will serve as a breakthrough in the photocatalytic applications via designing microflower type photocatalysts with remarkable performance. © Malaysian Journal of Microscopy (2020). All rights reserved.