高氙酸盐是高氙酸（H₄XeO₆）所成的盐，含有高氙酸根离子—XeO₆。高氙酸盐都是强氧化剂，可由四氧化氙溶于水生成高氙酸，再用碱中和得到。

高氙酸盐的溶解性与碳酸盐类似，高氙酸钾和高氙酸钠可溶于水，高氙酸钡难溶，并用作制备四氧化氙的原料。它与浓硫酸混合发生复分解反应，滤去硫酸钡沉淀，并将生成的高氙酸干燥就可得到四氧化氙：

Ba₂XeO₆(s) + 2H₂SO₄(aq) → H₄XeO₆(aq) + 2BaSO₄(s).

In chemistry, perxenates are salts of the yellow xenon-containing anion XeO4−
6. This anion has octahedral molecular geometry, as determined by Raman spectroscopy, having O–Xe–O bond angles varying between 87° and 93°. The Xe–O bond length was determined by X-ray crystallography to be 1.875 Å.