  We discuss the potential of the eXTP X-ray telescope, in particular its
Spectroscopic Focusing Array (SFA), Large Area Detector (LAD) and Wide Field
Monitor (WFM) for the detection of a signal from keV-scale decaying dark
matter. We show that the sensitivity of the eXTP is sufficient to improve
existing constraints on the mixing angle of the neutrino Minimal extension of
the Standard Model ($\nu$MSM) by a factor of 5-10 within the dark matter mass
range 2-50 keV, assuming 1% level of systematic uncertainty. We assert that the
eXTP will be able to probe previously inaccessible range of $\nu$MSM parameters
and serve as a precursor for the Athena mission in decaying dark matter
searches.
