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In view of the lack of information interaction steps in the traditional method of robot data encryption and transmission, and errors in the information replacement process, resulting in poor encryption effects, the design of a robot data encryption transmission control system based on blockchain technology is proposed. Analyze the hardware structure of the robot, and complete the information storage, operation and analysis on the Ts-210 model trusted storage, NoSQL database, and X86 server. According to the block chain link structure, abnormal situations can be discovered in time to prevent data from being maliciously tampered with. Decentralized and tamper-resistant information interaction is carried out on the blockchain, and the information transmitted by the robot data client is decomposed. After the information encoding process, the information encryption matrix can be obtained. Based on the original information matrix, select the initial key of encrypted information, and use blockchain technology to design the software encryption process of the robot data encryption transmission control system. Introduce the information signature verification mechanism, extract the encrypted information uploaded by the robot, and control the encryption process through the SHA-256 hash algorithm. It can be seen from the experimental results that the scrambling results of this method are consistent with the ideal results, and the maximum encryption degree is 98%, which provides help for the efficient encryption and transmission of information by the robot.