The utility model discloses a wheel online burring device which is composed of a machine frame, cylinders, motors, a guide rail, synchronous belts and a brush. A stopper at the tail end of a roller way fixes a wheel, the servo motor II enables a translation base plate and the corner cylinder to be moved above the wheel through the synchronous belts, after the lifting cylinder enables a fixture base plate to go downwards, the corner cylinder clamps the wheel, the lifting cylinder enables the wheel to be lifted upwards, the servo motor II enables the wheel to be above the brush through the synchronous belts, the lifting cylinder decreases to place the wheel in a V-shaped rotation ring, the driving motor II drives the wheel to rotate opposite to the rotation direction of the brush, and therefore burring efficiency and quality are improved; according to wheels of different sizes, the servo motor I can drive a gear shaft to rotate to drive racks to move, and therefore the size of the brush is adjusted. After burring is achieved, the lifting cylinder lifts up the wheel again, the servo motor II places the wheel to the other roller way, and the corner cylinder loosens the wheel.