Smoke alarm with positioning function

The utility model provides a smoke alarm with a positioning function, which relates to the technical field of smoke alarms and comprises a first shell and a second shell, a support rod is fixed on the outer surface of one side of the first shell close to the center, and a U-shaped clamping plate is fixed at one end of the support rod. According to the utility model, because the diameter of the U-shaped clamping plate is smaller than the distance between the two L-shaped clamping plates, a worker can easily take down the smoke alarm by pressing the two buttons at the same time when carrying out dismounting work, and can press the buttons again when carrying out mounting, so that the U-shaped clamping plate can be placed above the two L-shaped clamping plates, and the U-shaped clamping plate can be placed above the two L-shaped clamping plates by loosening the buttons. The L-shaped clamping plates are rebounded to the original positions by the reset springs, so that the U-shaped clamping plates and the L-shaped