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To solve the problem of incorrect encryption of information data caused by mismatch between public key text and private key text, and to achieve on-demand encryption processing of real 3D geographic information data, a blockchain based real 3D geographic information data encryption control system was designed. Set CPU host scheduling module, geographic information data processing module, and hybrid encryption module as the main components, combine digital signature structure, improve the connection form of vectorization calculation unit, and complete the hardware design of data encryption control system. According to the principles of blockchain encoding, determine the composition of key block roles and the definition conditions of public key cryptography, and based on this, calculate the data polynomial results. Based on the deployment form of Curl encryption nodes, the specific values of hidden encryption vectors are solved to achieve encryption processing of real-world 3D geographic information data. Combining relevant hardware application structures, complete the design of a blockchain based real-time 3D geographic information data encryption control system. The experimental results show that the length difference between the public key text and private key text of the designed system does not exceed 0.25KB, which can effectively solve the problem of incorrect encryption of information data caused by key text mismatch, and meets the practical application requirements of on-demand encryption processing of real 3D geographic information data.