Fire alarm device for fire engineering

The utility model discloses a fire alarm device for fire protection engineering, which is characterized in that air inlet holes are uniformly distributed below an outer shell, a circuit board is arranged inside the outer shell, a detection sensor is arranged below the circuit board, an installation mechanism is arranged on the upper side of the outer part of the outer shell through a threaded lantern ring, and an acrylic outer shell is arranged on the outer ring of the lower surface of the outer shell. An alarm lamp and a loudspeaker are arranged in the acrylic shell, a connecting pipe is arranged in the shell in a penetrating mode, and a sprinkler head is arranged at the lower end of the connecting pipe; according to the utility model, different mounting mechanisms are adopted to adapt to the mounting of different indoor suspended ceilings, the mounting is convenient and quick, and meanwhile, the sprinkler head is arranged to automatically and timely sprinkle water to extinguish fire when a fire disaster is