Energy-saving and environment-friendly illuminating lamp for building

The utility model discloses an energy-saving and environment-friendly illuminating lamp for a building. The lamp comprises a lamp body, the lamp body is composed of a lamp holder and a glass bulb. Theglass bulb is movably connected to the outer surface of the lower end of the lamp holder. Welding mud is connected between the lamp holder and the glass bulb; a circular sleeve seat is fixedly mounted at the upper end, close to the glass bulb, of the outer surface of the lamp body; the lamp body is surrounded by the circular sleeve seat; only an annular groove is formed in the outer surface of the lower end of the circular sleeve seat; the annular groove is internally provided with a thread, the annular groove is internally connected with an inner lampshade in a threaded mode, the inner lampshade is divided into a lampshade opening and a lampshade body, the outer surface of the lampshade opening is provided with a thread, the outer surface of the circular sleeve base is provided with a circular sliding groove in