The invention provides a multi-functional safety helmet. The multi-functional safety helmet comprises a safety helmet body and an automatic detection and alarm device for body temperature in the safety helmet body. The automatic detection and alarm device for body temperature comprises a temperature detection module, a controller, a touch detection module, a power supply and a video alarm module. The controller is connected with the temperature detection module, the touch detection module and the video alarm module. The power supply is connected with the controller and the touch detection module and supplies power to the controller and the touch detection module.The multi-functional safety helmet has following beneficial effects: higher detection precision of body temperature and more stable performance are obtained; the controller is adopted for automatic control so that manual opening and closing are not necessarily carried out and operation is performed conveniently; a burden of operation personnel is not increased; and a person at the abnormal body temperature is timely prevented from performing work so that occurrences of safety accidents are avoided.