The present application provides a broadcasting method and device for wireless communications, and relates to the field of communications. The broadcasting method includes: a broadcasting interception step of sending a broadcasting message with a current power and performing interception; a power decrease step of, when a request is intercepted, judging whether a sender of the request is identical with a sender of at least one historical request, and if yes, recording the current power as a historical power, and decreasing the current power; and a power determination step of judging whether a current broadcasting event ends, if yes, determining the historical power as a working reference power; otherwise, returning to the broadcasting interception step. The broadcasting method and device are conductive to reducing power consumption of communications.