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The railway communication network is prone to network attacks during data transmission, which reduces the security of the network. To address this issue, a railway communication network security encryption control system based on the narrowband Internet of Things was designed. Using STM32F103 as a narrowband IoT control terminal chip, it is used to collect, process, and analyze data. Through the control terminal and human-machine interface, USART is used to download and debug the computer, and an interface data transmission circuit is designed. The input current signal and voltage signal are switched using a dial switch circuit, and the output voltage is corrected by adjusting the resistance size to achieve efficient data transmission. By applying narrowband IoT encryption technology to ensure that each sub organization has a unique attribute key, combined with AES encryption algorithm, the data is encrypted into ciphertext. Through inverse transformation and decryption processing, noise phase is obtained to avoid disordered ciphertext affecting the sorting of sub ciphertexts, and communication network security encryption control is achieved. According to the system testing results, it can be seen that the maximum channel error rate of the designed system does not exceed 30%, and the maximum network throughput is 260bit/s, which has efficient encryption control capability.