The invention discloses a road and bridge construction surface spraying device. The road and bridge construction surface spraying device comprises a storage box for loading paint, a remote control vehicle for loading the storage box, a discharge cavity and a control device, wherein the control device is connected with the remote control vehicle in a bolted mode; the storage box is located above the remote control car, and the remote control vehicle is provided with a groove; the storage box is placed in the groove, and the storage box is fixedly connected with the groove; the storage box is detachably connected with the remote control vehicle through the groove, a material pumping pump is arranged on the right side of the storage box, and feed delivery pipes are connected to a feeding portand a discharging port of the material pumping pump; the feeding port and the discharging port of the material pumping pump are all connected with the corresponding feed delivery pipes on the feedingport and the discharging port in a bolted mode, the feed delivery pipes communicate with the discharge cavity, the feed delivery pipes are connected to the discharge cavity in a bolted mode, and thedischarge cavity is connected with a spraying pipe; and the spraying pipe is connected with the discharge cavity in a bolted mode, and the spraying pipe is provided with a spraying pump. The road andbridge construction surface spraying device can effectively spray uniformly.