1，發酵時間過長，沒有及時停止發酵，沒有及時倒空桶。俗話說，發酵了，酒就成了醋。
2.還有壹個原因是白酒被醋酸菌汙染，白酒變質變酸，不能飲用。
自釀葡萄酒的方法如下:
配料:新鮮葡萄，糖，容器。
第壹步是去市場買新鮮的葡萄，挑出不好的葡萄。
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第二步:將葡萄洗凈，用淡鹽水浸泡半小時，再沖洗幹凈。
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第三步，洗完之後放在外面幹凈的地方晾幹，不要讓葡萄把多余的水分帶進來。
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第四步:將幹葡萄碾碎，放入容器中。按照6斤葡萄1斤白糖的比例加入白糖，然後攪拌均勻，蓋上蓋子。
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第五步，夏天發酵壹周，秋天溫度低的時候發酵半個月。
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第六步，發酵後用濾網把酒過濾掉，可以過濾幾次再放進酒瓶裏。
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