The invention discloses a blockchain-based transaction processing method and device, relating to the technical field of data processing, and aiming at improving the processing efficiency of an accounting node to verify and process the received multiple transaction applications. The method disclosed by the invention includes the following steps: enabling an accounting node to acquire multiple transaction applications; performing parallel verification processing on digital signatures corresponding to the multiple transaction applications according to transaction information corresponding to eachtransaction application; grouping the multiple transaction applications according to the transaction information corresponding to each transaction application that is successfully verified to obtainN sets, and ensuring that the multiple transaction applications included in each set are transaction applications created by different transaction initiators; sequentially performing parallel verification processing on the transaction information corresponding to the multiple transaction applications included in each set; and putting the multiple transaction applications that are successfully verified into a block for storage. The scheme of the invention is applicable to a process that the accounting node performs verification processing on the received multiple transaction applications.