The present application discloses a resharding method and system for a distributed storage system, and the method comprises: when performing resharding for the bucket, accumulating a statistical value in each of pieces of shard statistical information into a header field; deleting each of pieces of shard statistical information, and creating, according to the number of shards after resharding, several pieces of new shard statistical information, wherein, the number of the pieces of the new shard statistical information is equivalent to the number of shards after resharding, and the several pieces of new shard statistical information have one-to-one correspondence with the shards after resharding; and grouping operation logs in an operation log set according to the number of shards after resharding, such that the number of groups of the operation logs is consistent with the number of shards after resharding.