The fire relay module cannot be transported by air. Because the relay module is mainly used in the area where the bus is in strong electromagnetic interference, electromagnetic interference will affect the flight trajectory of the plane, so the relay module cannot be transported by air. The fire-fighting linkage relay module consists of signal shaping, filtering and voltage stabilization, signal amplification and overcurrent protection circuit. It is used for long-distance transmission and amplification drive of various electrical signals in fire fighting linkage control system.