  The physical mechanism for triggering the changing-look phenomenon in active
galactic nuclei (AGNs) is still unclear. We explore this issue based on the
multi-wavelength spectral and flux variations for a changing-look AGN Mrk~1018
with long-term observations in the X-ray, optical/ultraviolet(UV), and radio
bands. Both the optical and the X-ray emission experience rapid decay in
changing-look phase during 2010--2015, where a re-flare appears in the
optical/UV and X-ray bands. We find a time lag of $\sim 20 $ days of optical/UV
behind X-ray variations in type 1.9 phase. The 5 GHz radio flux decreases by
$\sim 20$\% in type 1.9 phase during 2016--2017. We find both X-ray photon
index ($\Gamma$) and the optical-to-X-ray spectral index (\alphaox\,) are
anti-correlated with the Eddington scaled 2--10~keV X-ray luminosity
($L_\mathrm{X}/L_\mathrm{Edd}$) in the type 1.9 phase. However, the type 1
phase deviates from these two anti-correlations, which suggests that the change
of broad emission lines might be regulated by the evolution of accretion disk
(e.g., disappearing of the inner cold disk in the type 1.9 phase).
