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For the "last kilometer" problem existed in the Delivery logistics industry links, the paper designs and implements an efficient and secure express delivery system based on internet of things. Complexing the internet of things, embedded sensors, GPRS and other technologies, using embedded microprocessor S3C6410 as the main controller of the express delivery box, the system stores the express mail automatically storage, sends a notification SMS to customers, fetch the express mail through checking verification code, and realizes the abnormal mail processing and emergency alarm functions. After testing, the system runs stably in a real environment, is capable of completing delivery efficiently. It can be laid in a wide range of residential units and other public places, with a very broad market value.