The invention discloses a multifunctional flange which comprises a main body and a gasket mounted on the main body, wherein four fixed rings are arranged between the gasket and the main body; rotatingrings are arranged in the fixed rings; four adjusting and controlling blocks are fixed at positions, inwards, of the gasket and are corresponding to the fixed rings in positions; moving blocks are arranged on the adjusting and controlling blocks; every two adjacent adjusting and controlling blocks are fixed through a connecting ring; the connecting rings penetrate through the side faces of the adjusting and controlling blocks to stretch into the adjusting and controlling blocks; threads are formed in the connecting rings stretching into the adjusting and controlling blocks; a rack and a gearare arranged in each of the adjusting and controlling blocks; each of the movable blocks stretches into the corresponding adjusting and controlling block through a transverse groove in the adjusting and controlling block and is fixed with one end of the corresponding rack; the other end of the rack is matched with the corresponding thread through a rotating wheel; the rack is mounted between the corresponding gear and the movable block; and a telescopic strip is mounted on each of the gears. The flange is coated with special coating, and the coating can freely adjust the diameter of the flangeto enable the flange to be suitable for connection between two different pipelines; and in addition, the coating is high in fixing effect, indicates leakage at a connecting part and brings great convenience for an installer.