Acousto-optic fire alarm

The utility model discloses an acousto-optic fire alarm, which aims at solving the technical problems of present products including contact failure and instable performance. The acousto-optic fire alarm comprises an upper cover (1), an alarming circuit board (2) and a pedestal (3); and is characterized in that the pedestal (3) comprises a spring part (4), wherein the spring part (4) is composed of a contact member (41), a spacing member (41) and a fixing member (43), and the spring part (4) is of a flatwise F shape whose front and rear ends have certain radians respectively. According to the utility model, the spring part elastically contacts with a pin whose front end is of a solid cylindrical structure, thereby greatly increasing contact area of the fire alarm, effectively solving the problems caused by contact failure of the spring part and the pin, prolonging the service life of the fire alarm, and reducing the maintenance cost for customers.