Warning buffer device for preventing secondary accident on expressway

The utility model discloses a warning buffer device for preventing secondary accidents on an expressway, and relates to the technical field of warning device materials. In order to solve the problems that certain dangerousness exists in the device placing process and the directional lane changing effect is not achieved, the device comprises a device box and a sealing plate arranged above the device box, and the inner surface of the device box is fixedly connected with a first mounting plate; through the arrangement of the indicator lamp, when an accident vehicle is located on the first lane on the inner side, a rightward indication board of the indicator lamp flickers to prompt a rear vehicle to change driving rightward; when the accident vehicle is located on the second lane or the third lane on the inner side, the rightward indication board and the leftward indication board of the indication lamp flicker at the same time to prompt the rear vehicle to change driving leftwards and rightwards; when an accident