The invention discloses continuous starching equipment for a highway guardrail. The continuous starching equipment includes an advancing device advancing along the guardrail and a working device; theadvancing device includes a first frame and a second frame, the first frame is connected to the second frame through a frame connection mechanism, a travel driving mechanism and travel roller assemblies are connected to the lower end of the first frame, a first side support wheel assembly is connected to the inner side of the first frame, and a second side support wheel assembly is arranged on theinner side of the second frame; and the working device includes a grouting mechanism, a vibrating mechanism and a smoothing mechanism, and the grouting mechanism, the vibrating mechanism and the smoothing mechanism are sequentially connected to the first frame from front to back. By means of the continuous starching equipment for the highway guardrail, in the highway guardrail maintaining stage,time, manpower and material resources can be greatly saved. The continuous starching equipment is compact in structure, simple in operation, convenient to use and integrated in function, and can conduct continuous starching operation.