The invention provides a one-inlet three-outlet four-way reversing spherical valve which comprises a valve body, a valve cover, a valve stem and a spherical valve core, wherein the valve cover is arranged at the upper end of the valve body; the valve stem is arranged in the valve body; the spherical valve core is arranged at the lower end of the valve stem; the part, penetrating through the valve cover, of the valve stem is fixedly sleeved by a handwheel, and the top end of the valve stem is provided with a fixing nut; four mounting holes with internal threads are uniformly formed in the valve body along the circumferential direction of the external surface; four valve ports are arranged in the mounting holes by virtue of external threads; the middle of the spherical valve core is provided with a medium passage; the medium passage consists of a vertical hole and an arc-shaped groove; the diameter of the vertical hole is equal to those of the valve ports; the thickness of the arc-shaped groove is equal to the diameters of the valve ports; the arc angle of the arc-shaped groove is 90 degrees; a plane in which the medium passage is positioned is vertical to the valve stem. The one-inlet three-outlet four-way reversing spherical valve is simple in structure, has a function of substituting for four valves and ensures that pipeline connection in a one-inlet multi-outlet pipeline passage is simple.