Assembled smoke alarm device

The utility model relates to the technical field of smoke alarms, and discloses an assembled smoke alarm device which comprises a splicing device, the splicing device comprises a box body, the lower end of the box body is fixedly connected with a support, and the two ends of the support are both slidably connected with limiting plates. A smoke detector and a camera are sequentially installed in the middles of the two limiting plates from left to right, inserting rods are slidably connected to the inner sides of the four corners of the support, baffles are fixedly connected to the ends, away from the limiting plates, of the inserting rods, and the outer surfaces of the inserting rods are sleeved with first springs. According to the assembled smoke alarm device, a limiting plate slides into a support, a limiting rod is shifted outwards and rotated, a baffle and an insertion rod are driven to move towards the support under the action of a first spring, and the insertion rod is inserted into the limiting plate, s