In order to solve the problem that redundant rules in cooperative firewall will reduce the throughput, a bidirectional redundancy deletion approach to high-throughput cooperative firewall was presented to explore cooperative firewall with one administrative domain. This approach removes redundant rules of two firewalls in cooperative firewall by comparing the rules of two firewalls, and simultaneously enhance the throughput of whole cooperative firewall. The result of the simulation experiment shows that, redundancy rate of the approach reached 22.7%, and the cooperative firewall throughput was improved 8.2%. Compared with the existing methods, the approach benefits more in removing the redundancy rules of cooperative firewall and improving the cooperative firewall throughput.