The utility model discloses an overhead power line passerby spring-type warning device. The warning device comprises a warning light and a spring-type suspension system. The suspension system includes a suspension mechanism, a wire positioning and compressing mechanism, and a wire positioning and bearing mechanism. The wire positioning and compressing mechanism is arranged in a square groove of the suspension mechanism and supported on the suspension mechanism by positioning springs. A trapezoidal groove is disposed at the center position of the upper end face of the wire positioning and compressing mechanism. The wire positioning and bearing mechanism includes two positioning carrier blocks. Both the positioning carrier blocks have an oblique front end face, and the two oblique front end faces are in contact connection, forming a V-shaped groove. A return spring sheet is embedded between each positioning carrier block and the square groove. The warning light includes an illuminant and a power supply. The power supply adopts a solar panel and a high-capacity high-energy lithium battery. The illuminant adopts a special lighting source which uses a twinkling red or yellow lighting source to give a warning signal, having high brightness and high penetrating power, so that the operator is enabled to find moving objects passing by and take preventive measures in time, thereby preventing power transmission line accidents.