A mosquitocidal lamp with alarm function, having an electric mosquitocidal device which has a shell, attracting lights provided inside the shell for attracting mosquitoes, and a high-voltage electric net; the shell is provided with first openings allowing mosquitoes and insects to fly through; the shell of the electric mosquitocidal device is connected with a gas alarm device. A lighting device is also connected to a housing. Compared with prior art, the mosquitocidal lamp with alarm function can kill mosquitoes and at the same time detect the concentration of smoke in the surrounding. Preferably, lighting function is also provided.