  A central compact object (CCO, e.g. a black hole) with an accretion disk has
been suggested as the common central engine of various astrophysical phenomena,
such as gamma-ray bursts (GRBs), tidal disruption events (TDEs) and active
galactic nuclei (AGNs). A jet powered by such a system might precess due to the
misalignment of the angular momenta of the CCO and accretion disk. Some
quasi-periodic behaviors observed in the light curves of these phenomena can be
well interpreted within the framework of a precessing jet model. In this paper,
we study the emission polarization of precessing jets in the three kinds of
phenomena. The polarization angle also shows a gradual change for the
synchrotron emission in both the random and toroidal magnetic field
configurations with the precessing jet, while it can only change abruptly by
$90^\circ$ for the non-precessing top-hat jet. Polarization properties are
periodic due to the assumptions made in our model. The polarization
observations are crucial to confirm the precession nature of jets in GRBs, TDEs
and AGNs.
