The invention discloses an outdoor emergency guide signboard system design method. The design method comprises the following steps: S10, setting outdoor emergency guide signboard composition elements;s20, analyzing each component of the emergency guide identifier, and summarizing influence factors of the outdoor emergency guide identifier in combination with a setting method and an action processof the emergency guide identifier; s30, establishing an outdoor emergency guide identifier reading model; s40, determining a design principle; s50, determining a background color, symbol color and character color design method for identification, a graph and symbol design method for identification, a character language, font, word frequency and pronunciation design method for identification, andan identification bearing information design and metric verification method from the perspective of identification content design; an identification shape design method, an identification size designmethod, an identification supporting structure design method, an identification light source effect verification experiment and a light source design method are determined from the angle of identification structure design, and outdoor emergency guide signboard design is completed.