Landmark line coating device capable of easily controlling thickness

The utility model provides a ground marking line coating device capable of easily controlling the thickness. The ground marking line coating device comprises a base, a storage box, a blanking box and a transmission mechanism, the two ends of the front rotating shaft and the two ends of the rear rotating shaft are connected with idler wheels respectively. The blanking box is provided with a feeding port and a first discharging port, the storage box is communicated with the feeding port, and the first discharging port is formed in the side face of the blanking box; the blanking box further comprises an acceleration roller, the acceleration roller is arranged at the first discharging port in the blanking box, the rear rotating shaft is connected with the transmission mechanism and drives the transmission mechanism to move, and the transmission mechanism is connected with the acceleration roller and drives the acceleration roller to rotate. The flow speed of the coating at the first discharging port is automatica