  We study and discuss the critical behavior of charged by nonlinear
electrodynamics (NED) AdS black holes in an extended phase space. The negative
cosmological constant is treated as a thermodynamic pressure and the black hole
mass is considered as the chemical enthalpy. We show the analogy of
thermodynamics and phase transitions studied with the Van der Waals liquid-gas
system. We introduce new thermodynamic quantities conjugated to the NED
coupling and a magnetic charge. It was demonstrated that the first low of black
hole thermodynamics and the Smarr relation hold. We have calculated the
Joule--Thomson thermodynamic coefficient and inversion temperature and the
Joule--Thomson adiabatic expansion is investigated.
