The utility model discloses a high-voltage line warning device comprising a solar panel, a control part, a distance sensor and a sound and light alarm part. The solar panel adsorbs sun light to provide power supply for the control part. The distance sensor is responsible for detecting the condition in a warning distance. Once a pedestrian or vehicle enters into the warning distance, the distance sensor inputs an alarm signal to the control part, the control part outputs an alarm signal to the sound and light alarm part for warning, and SMS and MMS are sent to the mobile phone of management personnel. According to the high-voltage line warning device, the solar panel is used to adsorb sun light to provide the power supply, an additional power supply is not needed, and the energy is saved. A flashing warning lamp and high decibel level alarm sound are used to emit warning, the pedestrian and vehicle can be timely reminded, and thus a high-voltage accident is avoided. While the warning is emitted, a field MMS is sent to the management personnel automatically, the management personnel can open a mobile phone video to view field condition, and the working efficiency is greatly improved.