  We present the data release (DR) 5 catalogue of white dwarf-main sequence
(WDMS) binaries from the Large Area Multi-Object fiber Spectroscopic Telescope
(LAMOST). The catalogue contains 876 WDMS binaries, of which 757 are additions
to our previous LAMOST DR1 sample and 357 are systems that have not been
published before. We also describe a LAMOST-dedicated survey that aims at
obtaining spectra of photometrically-selected WDMS binaries from the Sloan
Digital Sky Survey (SDSS) that are expected to contain cool white dwarfs and/or
early type M dwarf companions. This is a population under-represented in
previous SDSS WDMS binary catalogues. We determine the stellar parameters
(white dwarf effective temperatures, surface gravities and masses, and M dwarf
spectral types) of the LAMOST DR5 WDMS binaries and make use of the parameter
distributions to analyse the properties of the sample. We find that, despite
our efforts, systems containing cool white dwarfs remain under-represented.
Moreover, we make use of LAMOST DR5 and SDSS DR14 (when available) spectra to
measure the Na I {\lambda}{\lambda} 8183.27, 8194.81 absorption doublet and/or
H{\alpha} emission radial velocities of our systems. This allows identifying
128 binaries displaying significant radial velocity variations, 76 of which are
new. Finally, we cross-match our catalogue with the Catalina Surveys and
identify 57 systems displaying light curve variations. These include 16
eclipsing systems, two of which are new, and nine binaries that are new
eclipsing candidates. We calculate periodograms from the photometric data and
measure (estimate) the orbital periods of 30 (15) WDMS binaries.
