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In order to solve the problem of abnormal identification of privacy information caused by the limited implementation capacity of communication network encryption, and improve the network system's ability to encrypt private texts, a communication network node location privacy encryption control model based on the blockchain is designed. With the support of blockchain technology, establish a password consensus mechanism, and then solve the node encryption difference according to the encoding form of the protocol clauses in the smart contract to complete the encryption verification of communication network nodes based on the blockchain. According to the definition conditions of information sequence, two kinds of information sequence processing structures, P box and S box, are established to complete the design of privacy information sequence generator for communication network node location. Standardize the data frame format of privacy information, determine the value range of entropy control coefficient according to the query result of key content, and then implement entropy verification processing to achieve the design of the location privacy encryption control model of communication network nodes based on the blockchain. The experimental results show that under the effect of blockchain technology, the total number of information samples that can be encrypted and processed by the communication network in a unit time reaches 9.8 × 1013bit, the problem of privacy information identification exception caused by the limited encryption execution ability has been well solved, which can strengthen the network system's ability to encrypt and process private text.