The light-diffusion LED lamp according to the present patent application includes LED blue light chips and light-guiding column, wherein a substrate of the LED blue light chips is provided with a blocking wall made of reflective heat-conducting materials, chips thereof are provided within the blocking wall, and the upper surface of the substrate within the blocking wall is covered with a transparent heat-conducting layer. The lower portion of the transparent light-guiding column is attached with a cover plate, the bottom surface of which is provided with stepped grooves that match with the LED blue light chips, the side wall of the second stepped groove thereof and the upper surface of the cover plate are provided with a light reflective layer, the top surface of which is covered with a fluorescent layer, and the top portion of the transparent light-guiding column has a reflective structure mounted thereon.