  We employ our new model for the polarised emission of accreting X-ray pulsars
to describe the emission from the luminous X-ray pulsar Hercules X-1. In
contrast with previous works, our model predicts the polarisation parameters
independently of spectral formation, and considers the structure and dynamics
of the accretion column, as well as the additional effects on propagation due
to general relativity and quantum electrodynamics. We find that our model can
describe the observed pulse fraction and the pulse shape of the main peak, as
well as the modulation of the cyclotron line with phase. We pick two
geometries, assuming a single accretion column or two columns at the magnetic
poles, that can describe current observations of pulse shape and cyclotron
modulation with phase. Both models predict a high polarisation fraction,
between 60 and 80\% in the $1-10$ keV range, that is phase- and
energy-dependent, and that peaks at the same phase as the intensity. The phase
and energy dependence of the polarisation fraction and of the polarisation
angle can help discern between the different geometries.
