The present specification discloses a consensus method and system in a consortium blockchain, where the method includes the following: When a first consensus node in a consensus network of the consortium blockchain does not complete a consensus operation on target data on which a consensus is to be reached within a predetermined time period, the first consensus node broadcasts a view change (ViewChange) message in the consensus network based on a P set and a Q set constructed from a received ECHO message. For a received ViewChange message, a second consensus node sends a view change acknowledgment (ViewChangeACK) message corresponding to the received ViewChange message to a second consensus primary node, where the second consensus primary node is a consensus primary node after the first consensus primary node. When the second consensus primary node receives N-f-2 ViewChangeACK messages sent by consensus nodes in the consensus network, the second consensus primary node obtains a plurality of identical P sets and a plurality of identical Q sets in the received ViewChange message. The second consensus primary node makes a view change decision based on the received ViewChange message.