A phenomenological analysis of the $\mathrm{CP}$-violation effect in hyperon-antihyperon nonleptonic decays is made. The following bounds are obtained: $\left|sin\frac{1}{2}\right({\Delta }_1-{\Delta }_3\left)\right|\le {0.61}_{-0.\mathrm{}0}^{+0.\mathrm{}27},$ where (${\Delta }_1-{\Delta }_3$) is the $\mathrm{CP}$-violation phase; $\gamma ({\Sigma }^{+}\to n{\pi }^{+})\ge -0.971\mathrm{}\pm 0.003;$$\frac{\left|\Gamma \right({\Sigma }^{+}\to n{\pi }^{+})-\Gamma (\overline{{\Sigma }^{+}}\to \overline{n}{\pi }^{-}\left)\right|}{\Gamma ({\Sigma }^{+}\to n{\pi }^{+})+\Gamma ({\Sigma }^{+}\to p{\pi }^0)}\lesssim 7\%.$

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