  We study creation of entanglement and quantum steering in a parity-time- (PT
-) symmetric cavity magnomechanical system. There is magnetic dipole
interaction between the cavity and photon-magnon, and there is also
magnetostrictive interaction which is induced by the phononmagnon coupling in
this system. By introducing blue-detuned driving microwave field to the system,
the bipartite entanglement of the system with PT -symmetry is significantly
enhanced versus the case in the conventional cavity magnomechanical systems
(loss-loss systems). Moreover, the one-way quantum steering between
magnon-phonon and photon-phonon modes can be obtained in the unbroken-PT
-symmetric regime. The boundary of stability is demonstrated and this show that
the steady-state solutions are more stable in the gain and loss systems. This
work opens up a route to explore the characteristics of quantum entanglement
and steering in magnomechanical systems, which might have potential
applications in quantum state engineering and quantum information.
