The application of blockchain technology means that smart home devices will be greatly improved in terms of versatility and security, allowing people to use them more safely and conveniently in their daily home life. For smart home practitioners, blockchain technology means the arrival of the next “window”, indicating that the industry will develop from the budding stage to the popular stage. This paper proposes a smart home system based on the Ethereum blockchain as a platform. Through the use of smart contract technology, it not only builds a closed-loop management platform from energy suppliers to end users but also realizes cross-ecological communication. At the same time, this paper also examined the latency problem of “solidity” in the multi-contract call environment. By comparing the local pace test and the blockchain-side pace test, we found that the function invoked pace inconsistent between local-side and chain-side existed but the delay can be controlled within one second.