The article discusses the main safety warning types of power grid for meteorology and ice cover, and elaborates the safety warning strategy of power grid from four perspectives: safety technology dimension, safety strategy dimension, safety guarantee dimension, and building a comprehensive defence system, based on OPA model, CASCADE model, hidden fault model, Manchester model, and optimal tide outage model researched by previous researchers. From the perspective of power grid structure, interface and controller, signal, and control strategy, the author gives the operation control, voltage stabilization control, power control, and islanding control strategies to grid security warning through simulation experiments. Power grid safety and accident prevention prospective and preventive have become important technical means of safety production management. Through the research, the first mothed is to solve the problem that some enterprises are used to mending leaks afterwards, an inspection a blockage, did not play the role of early warning; the second is to solve the problems of equipment conditions backward, lack of special financial support, and early warning mechanism into paper; the third is to solve the lack of effective supervision, which makes the function of crisis information difficult to timely detection, analysis and judgment, even difficult to prevent and pre-control the occurrence of accidents effectively; and the fourth method is to solve the problem of the lack experience for some enterprises in grid accident decision-making and post-accident response, which may lead to the spread of accidents.