Exploring highly efficient visible-light-driven photocatalyst for the elimination organic pollutants is a great concern for constructing sustainable green energy systems. In the current work, a novel hybrid ternary WO3@g-C3N4@MWCNT nanocomposites have been fabricated for visible-light-driven photocatalyst by self-assembly method. The as-prepared photocatalyst was examined by XRD, Raman, FESEM, HRTEM, XPS EDS, EIS, UV–visible DRS, and PL analysis. The experimental results revealed that the photocatalytic activity of WO3@g-C3N4@MWCNT nanocomposites on the degradation of Tetracycline (TC) is 79.54% at 120 min, which is higher than the binary WO3@g-C3N4 composite and pristine WO3. The improved degradation performance towards TC is recognized for its higher surface area, intense light absorption towards the visible region, and enhanced charge separation efficiency. Consequently, the fabricated catalyst endows a promising application for antibiotic degradation. Display omitted •We fabricated WO3/g-C3N4/MWCNT hybrid nanostructure by simple low temperature hydrothermal process.•Photocatalytic degradation of TC were observed under visible light.•WO3/g-C3N4/MWCNT sample showed excellent degradation of tetracycline.•WO3/g-C3N4/MWCNT hybrid structure has been probed as a potential applicant for visible light driven photocatalyst.