With the development of social economy, the importance of fire safety has become increasingly prominent, and higher requirements have been put forward for the stability of the fire protection system. With reference to the national "Specifications for the Design of Automatic Sprinkler Systems" and other fire protection codes, we proposed a PLC-based electrical structure design scheme for the inspection and emergency devices of the fire protection system. This scheme is beneficial to improve the maintainability and scalability of the system, enhances the convenience of operation and the intuitiveness of monitoring, and has good application value.