The utility model discloses a bridge floor waterproof layer construction travelling car for spraying, including the railway carriage or compartment frame, the railway carriage or compartment mounts between the wall of spill part both sides, the railway carriage or compartment is erect and is put vertical gyro wheel, roll on the border of vertical gyro wheel guidance tape top surface in orbit, therailway carriage or compartment is erect and is put the railway carriage or compartment board, the railway carriage or compartment board is reserved the through -hole or is passed through the groove at the work face of spraying paint, highly coming fixing hole or passing through the working face orbit in groove through vertical gyro wheel, the railway carriage or compartment is erect and is put horizontal gyro wheel, horizontal gyro wheel prevents through horizontal gyro wheel that the lateral deviation realization is transversely spacing along the lateral wall roll, the realization is sprayedpaint, and work face track is accurate, the linearity is suitable directly, the appearance is pleasing to the eye, prevents the spraying and pollutes.