Nebular emission lines are powerful diagnostics for the physical processes at play in galaxy formation and evolution. Moreover, emission-line galaxies (ELGs) are one of the main targets of current and forthcoming spectroscopic cosmological surveys. We investigate the contributions to the line luminosity functions (LFs) of different galaxy populations in the local Universe, providing a benchmark for future surveys of earlier cosmic epochs. The large statistics of the observations from the SDSS DR7 Main galaxy sample and the MPA-JHU spectral catalogue enabled us to precisely measure the H{alpha}, H{beta}, [OII], [OIII], and, for the first time, the [NII], and [SII] emission-line LFs over ~2.4Gyrs in the low-z Universe, 0.0210^42^erg/s, L[OIII]>10^43^erg/s), where the contribution of Seyfert galaxies is not negligible.