The utility model belongs to the technical field of underground space operation and hard rock tunnel construction apparatus, especially, relate to a multifunctional safety cap for tunnel construction,including the cap body, set up at the hat lining of cap internal portion and set up the brim of a hat at cap body front end, still listen the button and dial the button including intelligent controlware, antenna, earphone, microphone, the heavy re -harvesting who sets up in cap body one side, be provided with power module and beidou positioning module between the cap body and the hat lining, beprovided with the oxygen sensor on the brim of a hat, the intelligent control ware is listened the button, is dialed button, beidou positioning module and oxygen sensor and be connected with antenna,earphone, microphone, heavy re -harvesting, the intelligent control ware includes wireless transmission module, wireless transmission module and workstation intercommunication. This safety helmet cannot only the protecting work personnel safety, have the function of employee attendance, oxygen concentration monitoring, personnel location, both -way communication and radiation protection moreover.