The embodiments of the present disclosure provide road warning method and device. The device includes: a screen; a receiving module, configured to receive warning contents and transmit the warning contents to a displaying module and a data processing module; a positioning module, configured to acquire position information of the screen and transmit the position information to the data processing module; a displaying module, configured to display the warning contents on the screen; a data processing module, configured to organize the warning contents and the position information into warning information and transmit the warning information to a transmitting module; and a transmitting module, configured to transmit the warning information to objective vehicles within a predefined distance range, wherein the objective vehicles include vehicles supporting V2X communication. The present disclosure can achieve effects of long communication distance, excellent warning effect and editable warning contents, effectively ensuring traffic safety.