The utility model discloses a safety device for an outdoor construction worker. The safety device comprises a cap clamp and a brim. A fluorescent band is arranged on the cap clamp, and the cap clamp and the brim are fixedly connected. An illumination lamp is arranged on the cap clamp, and two ropes are arranged on the lower portion of the cap clamp. The brim is made of a plastic material. The safety device for the outdoor construction worker is novel in design and convenient to use. When the safety device for the outdoor construction worker is used, the cap clamp is arranged on a helmet, and then the cap clamp is fixed through the ropes. The safety device for the outdoor construction worker has the effect of preventing ultraviolet rays, wind and sand, the fluorescent band is arranged on the cap clamp and plays a role of warning and reminding to some extent, construction staff at a high place can be reminded not to throw down dangerous goods, and personnel safety of the worker is guaranteed.