  PSR~J1119$-$6127, a high-magnetic field pulsar detected from radio to
high-energy wavelengths, underwent a magnetar-like outburst beginning on July
27, 2016. In this paper, we study the post-outburst multi-wavelength properties
of this pulsar from the radio to GeV bands and discuss its similarity with the
outburst of the magnetar XTE~J1810$-$197. In phase-resolved spectral analysis
of 0.5--10\,keV X-ray data collected in August 2016, the on-pulse and off-pulse
spectra are both characterized by two blackbody components and also require a
power-law component similar to the hard X-ray spectra of magnetars. This
power-law component is no longer distinguishable in data from December, 2016.
We likewise find that there was no substantial shift between the radio and
X-ray pulse peaks after the 2016 X-ray outburst. The gamma-ray pulsation after
the X-ray outburst is confirmed with data taken after 2016 December and the
pulse structure and phase difference between the gamma-ray and radio peaks
($\sim$0.4 cycle) are also consistent with those before the X-ray outburst.
These multi-wavelength observations suggest that the re-configuration of the
global magnetosphere after 2016 magnetar-like outburst at most continued for
about six months. We discuss the evolution of the X-ray emission after the 2016
outburst with the untwisting magnetosphere model.
