The invention relates to the digital transaction in assets on the Internet, and provides a distributed shared general ledger construction method of a block chain. The method comprises the following steps: generating one or a plurality of transaction auxiliary chains, and constructing a unique transaction main chain of a system according to the block information of the transaction auxiliary chains; and causing the transaction auxiliary chains and the transaction main chain to independently carry out respective block chain verification and transaction verification, if the transaction verification is qualified on both the transaction auxiliary chains and the transaction main chain, proving that the transaction actually exists, and otherwise, proving that the transaction does not exist. The distributed shared general ledger construction method of the block chain supports the transaction in assets of various businesses, wherein the transaction in assets comprises the transaction of non-monetary assets in the block chain, such as credit notes, intelligent properties, discount coupons, bonds and the like, and meanwhile, the distributed shared general ledger construction method supports transfer among different business assets. In addition, the update of key functions can be carried out on the transaction auxiliary chains, so that update speed can be improved, and a risk that the transaction main chain is broken can be avoided.