Multifunctional fire alarm device

The utility model relates to the field of fire-fighting alarm, in particular to a multifunctional fire-fighting alarm device which comprises a fire-fighting alarm shell, a temperature sensor, a smoke sensor, a probe, a control processing module and a voice module are installed in the fire-fighting alarm shell, and an adjusting mechanism is arranged at the top end of the fire-fighting alarm shell. A protection mechanism is arranged at the bottom end of the fire alarm shell, and a test button is arranged at the bottom end of the fire alarm shell; the adjusting mechanism comprises a hollow rod. By arranging the adjusting mechanism and rotating the threaded rod, the first clamping plate continuously slides in the concave plate to extrude and clamp the indoor fixed beam, the installation is convenient, the insertion rod slides in the hollow rod to extend the fire alarm shell, so that the fire alarm shell is located in the central area of the indoor space, and the safety of the fire alarm shell is improved. The fir