Bus security alarm system

The utility model discloses a bus safety alarm system, which comprises a field bus, a connection test device, an alarm and industrial control equipment, and is characterized in that the field bus is connected with field equipment; the connection test device is respectively connected with the field bus and the alarm, and is used for testing the connection condition of the field bus, and sending an alarm instruction to the alarm when the connection is abnormal; and the alarm is connected with the industrial control equipment, gives an alarm when receiving an alarm instruction sent by the connection test device, and sends an alarm signal to the industrial control equipment at the same time. The special connection testing device is arranged to carry out real-time connection testing on the field bus so as to ensure that the connection condition of the field bus can be known in time, and when the connection of the field bus is known to have a problem, the alarm device reports the connection fault of the field bus t