Expressway base layer maintenance device

The utility model relates to the technical field of road base, and discloses an expressway base maintenance device, which comprises two support plates and a material box, the bottom surface of the material box is fixedly connected with the upper surfaces of the two support plates, the upper surface of the material box is fixedly communicated with a feed pipe, the bottom surface of the material box is fixedly communicated with a discharge valve, and the discharge valve is fixedly communicated with the material box. A U-shaped plate is fixedly mounted on the upper surfaces of the two supporting plates; by arranging the hydraulic rod, the sliding groove, the sliding block, the sliding plate and the connecting plate, the effect that the sliding plate can be driven to be matched with the sliding block through power provided by the hydraulic rod and stretch out and draw back in a track provided by the sliding groove is achieved, the purpose that the compacting plate can be driven to stretch out and draw back throug