  Considering the cosmological constant as the pressure, we mainly study the
laws of thermodynamics and weak cosmic censorship conjecture in the
Reissner-Nordstr\"{o}m-AdS black hole surrounded by quintessence dark energy
under charged particle absorption. The first law of thermodynamics is found to
be valid as a particle is absorbed by the black hole. The second law however is
found to be violated for the extremal and near-extremal black holes since the
entropy of these black hole decrease. Moreover, we find that the extremal black
hole do not change it configuration in the extended phase space, implying that
the weak cosmic censorship conjecture is valid. Remarkably, the near-extremal
black hole can be overcharged beyond the extremal condition under charged
particle absorption. That is, the cosmic censorship conjecture could be
violated for the near-extremal black hole in the extended phase space. To make
a comparison, we also discuss the first law, second law as well as the weak
cosmic censorship conjecture in the normal phase space, and find that all of
them are valid in this case.
