The invention discloses a novel fireproof down lamp. The novel fireproof down lamp comprises a metal lamp bracket. The bottom of the metal lamp bracket is of an annular structure. The annular structure is provided with a hollowed-out structure. The inner side of the annular structure is provided with a baffle. The upper end of the baffle is provided with a pair of pores. A metal radiator is nestedin the metal lamp bracket. A lens is attached to the inner wall of the metal radiator. A pair of reflective paper is attached to the outer surface of the lens. The bottom of the lens is provided witha waterproof ring. The upper end of the lens is provided with a support. An LED light source is arranged above the support. The upper portion of the metal radiator is in bolt connection with a shell.A wire hole is formed in the side, provided with a driving circuit, of the interior of the shell. A wire of the driving circuit extends to the outside through the wire hole. A terminal box is arranged at a wire port of the outer portion of the shell. A wire connector is arranged in the terminal box. The whole structure of the novel fireproof down lamp is hooked up. The novel fireproof down lamp achieves the dual fireproof effects of up-down combination of the iron lamp bracket and the aluminum alloy metal radiator and is safe and practical.