Helmet with warning effect

The utility model relates to a safety cap with a warning effect, which is formed by the method that at least one luminous component is arranged at the outer part of a main body of the cap, and a power source, a light-controlling type switch, and a touch switch are all positioned on the main body, wherein the power source provides electricity required by the generation of bright light from the luminous component, the light-controlling type switch can automatically control the luminous component whether to generate the bright light according to the condition that sunlight can be detected or can not be detected in an external environment, and the touch switch can forcefully control the luminous component whether to continuously generate the bright light according to the situation that the touch switch bears a top pressure or not when the touch switch is in the state that the luminous component generates the bright light.