The legal concept of "earthquake early warning" is the basis of dealing with and standardizing earthquake early warning related behaviors, and it is also the essential problem to be clarified in earthquake early warning legislation. At present, no special laws and regulations on earthquake early warning have been formulated at the national level, and the regulations on the legal concept of "earthquake early warning" in the local administrative measures have not been completely consistent. With the development of earthquake early warning legislation, it is urgent and important to define and unify the legal concept of earthquake early warning. the legal concept of "earthquake early warning" should include its technical and social attributes, adhere to the principle of complete norms and avoiding ambiguity, and combine the elements of time, space, mechanism and influence. In order to deeply understand this concept, this paper also discusses the basic contents of earthquake early warning legal norms, such as issuing subject, early warning object, technical service, legal liability, etc.