Gateway hot backup system

The invention relates to a gateway hot backup system, which comprises a plurality of groups, wherein each group comprises N gateways, n backup gateways and a controller, the value range of N is that: 2 <=N<=16, nbackup gateways are connected with backup trunk lines 1-M. The controller comprises a monitoring unit, a recording unit, an executing unit and a reminding unit, wherein the monitoring unit is respectively connected with the recording unit and the executing unit, the recording unit is connected with the reminding unit, and the N gateways and the backup gateways are respectively connected with monitoring unit and the executing unit of the controller. A sequence number list for sequential starting of the n backup gateways is arranged in the recording unit, and an early warning database connected with the sequence number list is further arranged in the recording unit. Through the gateway hot backup system, staff do not need to enter a computer room, backup is automatically started up, manpower and cost are saved, restoring time is short, the lines are ensured to be smooth, and reliability is improved.