The smoke detection alarm is mainly realized by the optical maze. The maze has a set of infrared rays and receiving photocells with an angle of 135 degrees. When there is no smoke in the environment, the receiving tube can not receive the infrared light emitted by the infrared transmitting tube, and the subsequent sampling circuit has no electrical signal change; when there is smoke in the environment, the smoke particles enter the labyrinth to scatter the infrared light emitted by the transmitting tube. The intensity of the scattered infrared light has a linear relationship with the smoke concentration. The post-river acquisition circuit changes. The MCU built into the detector determines these changes to determine whether a fire has occurred. Once the fire alarm is confirmed, the detector emits a fire alarm signal. (Red) lights up and the buzzer alarm is activated. The alarm information is reported to the smart fire monitoring platform in real time.