棉花交割库是指用于进行棉花期货合约交割的仓库。在棉花期货交易中，交割库是重要的基础设施，用于保证期货交易的顺利进行和实物交割的完成。

当棉花期货合约到期时，需要进行实物交割。这时，持有期货合约的多头方需要将手中的棉花运送到指定的交割仓库，经过质量检验、确认数量和完成相关手续后，才能完成交割。交割库的作用是提供仓储、物流、质量检验等服务，确保交割过程的顺利进行。

在棉花期货交易中，交割库的选择非常重要。一般来说，交割库需要具备以下条件：一是具备符合国家标准和期货交易所规定的仓储设施和设备；二是具备专业化的物流配送体系；三是具备完善的质量检验能力和资质；四是具有较高的信誉度和良好的经营状况。

在我国，棉花期货交易主要在郑州商品交易所和上海期货交易所进行，相应的交割库也主要由这两家交易所指定。在进行棉花期货交易时，投资者需要注意选择具有交割库的期货合约，了解交割库的相关规定和操作流程，以避免因不熟悉交割流程而造成不必要的损失。

总的来说，棉花交割库是棉花期货交易中不可或缺的重要环节，它为投资者提供了一个安全、可靠、高效的实物交割平台，保障了期货市场的正常运转和交易双方的利益。

英文对照：

What is a cotton delivery depot?

A cotton delivery depot refers to the warehouse used for the delivery of cotton futures contracts. In cotton futures trading, delivery depots are important infrastructure facilities that ensure the smooth operation of futures trading and the completion of physical delivery.

When the cotton futures contract expires, physical delivery is required. At this time, the long holder of the futures contract needs to transport the cotton in their possession to the designated delivery depot. After quality inspection, quantity confirmation, and completing relevant procedures, the delivery can be completed. The role of the delivery depot is to provide warehousing, logistics, quality inspection and other services to ensure the smooth progress of the delivery process.

In cotton futures trading, the selection of delivery depots is very important. Generally speaking, delivery depots need to meet the following conditions: first, they must have storage facilities and equipment that meet national standards and futures exchange regulations; second, they must have professional logistics and distribution systems; third, they must have comprehensive quality inspection capabilities and qualifications; fourth, they must have high信誉度和 good business conditions.

In China, cotton futures trading is mainly conducted on the Zhengzhou Commodity Exchange and the Shanghai Futures Exchange, and the corresponding delivery depots are mainly designated by these two exchanges. When investing in cotton futures, investors need to pay attention to selecting futures contracts that have delivery depots, understand the relevant regulations and operating procedures of delivery depots, and avoid unnecessary losses caused by not being familiar with the delivery process.

Overall, cotton delivery depots are an indispensable important link in cotton futures trading. They provide investors with a safe, reliable, and efficient physical delivery platform, ensuring the normal operation of futures markets and the interests of both buyers and sellers.