The generalisation of the four-particle Faddeev-Yakubovsky equation to the relativistic case is carried out. The resulting system of integral equations is solved by the iteration method, and the binding energy of the ⁴He nucleus is calculated. One-rank separable potentials are used for the NN interaction. Only states with zero orbital angular momentum, i.e. S states, are considered in the calculations. The calculations are carried out taking into account both the “3+1” and “2+2” sub-channels in the equation. The results are compared with those of non-relativistic approximation and the experimental data.