本发明公开一种改性阳离子交换树脂催化剂,以固体超强酸SO_4~2-/ZnO为改性剂,以作为载体的阳离子交换树脂的重量为基准,改性剂固体超强酸SO_4~2-/ZnO以锌元素计占催化剂载体质量的1%~10%。所述的基体阳离子交换树脂的交换容量为4.4~5.3mol/kg,水的质量含量为45%~50%,湿视密度为0.80~0.95g/ml,湿真密度为1.1~1.3g/ml。本发明催化剂用于合成醋酸仲丁酯的反应过程,酯化效率高、选择性稳定性好,且没有设备腐蚀和环境污染 The present invention discloses a modified cation exchange resin catalyst, solid superacid SO_4 ~ 2- / ZnO as modifier, based on the weight of the cation exchange resin as a carrier, the modifier solid superacid SO_4 ~ 2- / ZnO, as a zinc element, accounts for 1% to 10% of the mass of the catalyst carrier. The base cation exchange resin has an exchange capacity of 4.4 to 5.3 mol / kg, a water content of 45% to 50%, a wet visual density of 0.80 to 0.95 g / ml and a wet true density of 1.1 to 1.3 g / ml . The catalyst of the invention is used for the synthesis reaction of sec-butyl acetate, has high esterification efficiency, good selectivity stability, no equipment corrosion and environmental pollution