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To solve the problem of uneven communication delay of data samples in the time-varying communication environment of industrial big data, a blockchain technology based industrial big data time-varying communication delay control system is designed. In the big data communication system, communication state observer and delay quantization controller are set to complete the application unit construction of time-varying communication delay control system. On this basis, a time series expression is constructed, and the range of delay parameters is determined by processing communication data samples to estimate the time-varying communication delay level of big data. According to the application requirements of blockchain technology, register necessary block nodes, and then determine the interaction relationship between communication data based on the trust measurement conditions of chain nodes. Complete the coding of control behavior, and collaborate with relevant application components to achieve the design of industrial large data time-varying communication delay control system based on blockchain technology. The experimental results show that under the influence of blockchain technology, the maximum and minimum communication delay of data samples are 0.63, effectively solving the problem of uneven communication delay and meeting the practical application requirements of building a stable industrial big data time-varying communication environment.