ABSTRACT A comprehensive and high-purity quasar candidate catalogue with precise redshift measurements is crucial for advancing quasar research and cosmology. In the era of extensive sky surveys, the efficient identification of quasars from large-scale data sets has become a significant challenge in modern astronomy. By cross-matching the J-PLUS DR3 data set with unWISE and numerous spectroscopic data sets with accurate classifications, we compiled a known sample of 740 562 sources, including 338 456 stars, 320 60…