The invention relates to the field of highway facilities, in particular to a highway protective device. The highway protective device comprises multiple mutually connected protective separate bodies, each protective separate body comprises an upper layer protective device, support devices are arranged on the bottoms of the two sides of the upper layer protective device, a bottom fixture arranged below a foundation is arranged at the bottom of each support device, the adjacent upper layer protective devices of the protective separate bodies are connected through buffer connecting devices, and the bottom fixtures of the adjacent protective separate bodies are fixedly connected to the foundation through fastening connection devices. The highway protective device is simple in structure and reasonable in design and can play a role of warning drivers during daytime and nighttime through a warning board, by means of the protective separate bodies, the protective and buffer effects on a vehicle can be achieved when the vehicle strikes the device, the requirements of people are effectively met, and the problems existing in the prior art are solved.