  The purpose of this paper is to construct and study equivariant Khovanov
homology - a version of Khovanov homology theory for periodic links. Since our
construction works regardless of the characteristic of the coefficient ring it
generalizes a previous construction by Chbili. We establish invariance under
equivariant isotopies of links and study algebraic properties of integral and
rational version of the homology theory. Moreover, we construct a skein
spectral sequence converging to equivariant Khovanov homology and use this
spectral sequence to compute, as an example, equivariant Khovanov homology of
torus links $T(n,2)$.
