The invention discloses a police helmet provided with a safety warning device. The helmet comprises a helmet body, a host machine, a power cord, a data line, a night-vision imaging system, a videography system, an intelligent early warning system, a voice intercom system, a movable light source system and a terminal information interaction system. On the basis of a novel design, the novel light, ductile, waterproofing and breathable police helmet, which is made from an environment-friendly material and replaces a conventional hard and rigid police helmet, can reduce overall weight and a ductility protection coefficient; by assembling a cushioning airbag device and by adding functions of intelligent early warning, night-vision imaging, terminal information interaction, satellite positioning and voice intercom, the beneficial effects of impact protection, intelligent early earning and real-time information interaction can be achieved; a multi-protection effect and global advantages can be provided for police affair work; the efficiency of the work can be effectively improved, and meanwhile, a casualty rate can be reduced; the helmet, which is made from an elastic material, can reduce a damage rate and prolong service life; the helmet has the beneficial effect of being convenient for long-term wearing; and the helmet, with the advantages of being scientific and innovative, efficient and pleuripotent, safe and practical, can become popular in polices.