Road surface marking device for road engineering construction

The utility model provides a road surface marking device for road engineering construction, which comprises two main rods, the two main rods are arranged side by side and staggered, threads are distributed on the main rods, gears meshed with the main rods are arranged beside the main rods, the gears are connected to a bottom plate, the main rods are fixed at the bottom end of the bottom plate through a third connecting plate and a sliding plate, and a rotating shaft is inserted into one end of the main rods, which is separated from the main rods. A rotating block is installed at the end, away from the main rod, of the rotating shaft, a nozzle is inserted into the bottom end of the rotating block, a box body is installed on the rear side of the top end of the bottom plate, spraying pipes are inserted into the two sides of the bottom end of the front portion of the box body, and the ends, away from the box body, of the spraying pipes are inserted into the rotating block; the bottom ends of the fixing pieces are