Highway subgrade protection framework

The utility model discloses a highway subgrade protection framework which comprises a supporting frame installed on the upper surface of a soil layer, a gravel layer is poured on the upper surface of the supporting frame, a subgrade layer is fixedly connected to the upper surface of the gravel layer, two arc-shaped pads are fixedly connected to the inner bottom wall of the supporting frame, and drainage pipes are fixedly connected to the upper surfaces of the two arc-shaped pads. The surface of the drainage pipe communicates with a connecting pipe, inclined supporting blocks are fixedly connected to the left side and the right side of the supporting frame, and a drainage frame is fixedly connected to the upper surfaces of the two inclined supporting blocks. According to the highway subgrade protection framework, rainwater on a subgrade can flow towards the two sides after being accumulated for a long time, flows into the drainage frame through the flow guide plates and enters the drainage area in the supporti