Data privacy protection method for smart power grid of expandable block chain

The invention discloses a data privacy protection method for an intelligent power grid of an expandable block chain, and the method comprises the following steps: S1, an initialization stage: an intelligent electric meter registers through a unique serial number, generates a plurality of secret key pairs for signature and verification, and a public key is used as a pseudonym and is also used for a first-layer block chain to generate a uckoo filter; s2, a data reporting stage: the intelligent electric meter performs dynamic pseudonym mapping on the power consumption data through a random algorithm; according to the method, the privacy of the power consumption data of the user is protected, and meanwhile, expandable mapping of which the calculation cost is lower than that of homomorphic encryption is used, so that the method can be deployed in edge equipment of which the calculation capability is limited; through unloading calculation of a large amount of transactions to the chain, the transactions are greatly