The invention discloses a road structure seam filling device, which comprises a feed box, a fixed installation plate, a hydraulic cylinder, a stirring motor, a stirring rod, a solenoid valve, a fixed plate, a protective pipe, a filling material placement box, a slideway, a first pneumatic The telescopic rod, the first air pump, the push rod, the box body, the second air pump, the second pneumatic telescopic rod and the micro motor, use the first air pump and the first pneumatic telescopic rod to adjust the angle of the fixed plate, so that the bottom ends of the two fixed plates are aligned Quasi-structural seam openings avoid material overflow, waste of resources, and increase costs. The hydraulic cylinder is used to adjust the height of the stirring motor so that the stirring rod extends into the structural seam. At the same time, the stirring motor is turned on to drive the stirring rod to rotate to stir the material in the structural seam so that it can be filled. Even without accumulation, the device is easy to operate, can accurately and quickly fill the structural joints, avoid material splashing, save resources, reduce costs, and at the same time fill evenly and work efficiently.