The invention discloses a spherical water film injection pipe fitting and relates to the technical field of water heating equipment manufacturing. The spherical water film injection pipe fitting comprises a basic pipe, and an injector head connected with the basis pipe through screws; the injector head is provided with a flat segment; the flat segment becomes flat gradually from the portion close to the water inlet end to the water outlet end; one face of the injector head is in the shape of a sector; the inclination angle of the sector of the injector head is 60 degrees; the width of the smallest position of the flat position of the water outlet end of the injector head is 0.6-1.3 mm; the flat segment is provided with a plurality of long holes; the width of each long hole is 0.6-1.3 mm; and the middle of each long hole is at least provided with one spherical ball through a groove in the hole wall of the long hole. Compared with the prior art, the problem that an existing injection pipe fitting cannot inject multiple planar water films or annular water films and has injection dead corners can be solved.