The invention discloses a real estate storage and transaction method based on a block chain. The system comprises the following function modules: an audit admission module, a real estate development module, a commercial house chain entering module, a commercial house pre-selling module, a second-hand room selling module and a data storage module, according to the invention, the problem of unsmoothinformation circulation among mechanisms is solved; house property development efficiency is low, certificates are counterfeited, the house property data traceability is poor; a series of problems ofprofit-in-the-middle quotient difference, real estate dispute and the like are solved; the invention discloses a real estate transaction method. Compared with the prior art, the transaction process is simplified, the participation of the third-party intermediary is needed in the traditional real estate transaction process, the real estate certificate storage and transaction method based on the block chain can realize the direct transaction of the seller and the buyer without the third-party intermediary, the transaction cost is reduced, the transaction efficiency is improved, and the high efficiency of real estate development, auditing and transaction is realized.