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The emergence of Industrial Internet of Things Industrial data security has received much attention. The security of data collection is directly related to the data security of industrial Internet. In the data acquisition system, the data acquisition (southbound) and cloud communication (northbound) protocols and the operating environment of the data acquisition system are the most important security attack targets of data acquisition terminals. After analyzing the security of the mainstream northbound MQTT protocol and southbound OPC UA protocol of the industrial IoT data mining security terminal and the trusted operating environment of the data mining system, a data mining security terminal supporting northbound MQTT and southbound OPC UA protocol is designed and implemented based on OpenSSL library on the domestic independent processor E2000D secure operating environment. The test results show that the industrial IoT data acquisition security terminal has high security performance in security authentication, access control, data integrity and data confidentiality.