Fast-assembled pipe fitting

The utility model discloses a fast-assembled pipe fitting, which comprises an upper pipe coupling and a lower pipe coupling which are both in a shape of semicircular column. The utility model is characterized in that the outer edge of one end of the upper pipe coupling is provided with a notch along the axis direction, and the outer edge of the other end is provided with a bayonet, and a plurality of bosses are arranged on the inner wall of the upper pipe coupling in a radial direction; the two axial ends of the upper pipe coupling are respectively provided with a sealing groove; the inner edge of one end of the lower pipe coupling is provided with a notch along the axis direction, and the inner edge of the other end is provided with a bayonet, and a plurality of bosses are arranged on the inner wall of the lower pipe coupling in a radial direction; the two axial ends of the lower pipe coupling are respectively provided with a sealing groove; the upper and the lower pipe coupling form a ring through butt joint. The utility model has advantages of simple structure, convenient construction, high joint strength between pipes and high work efficiency.