The invention discloses a spherical surface splice plate hyperboloid forming device and forming method. The spherical surface splice plate hyperboloid forming device comprises an upper roll shaft, a first lower roll shaft, a second lower roll shaft and supporting seat frames; the two ends of the first lower roll shaft and the second lower roll shaft are installed on the supporting seat frames through bearing seats respectively; the first lower roll shaft and the second lower roll shaft are arranged in parallel; the roll surface of each of the first lower roll shaft and the second lower roll shaft is a concave arc surface; two rotation chain wheels are arranged at the corresponding ends of the first lower roll shaft and the second lower roll shaft respectively and are connected with each other through a rotation chain to enable the first lower roll shaft and the second lower roll shaft to synchronously rotate; a drive chain wheel is arranged at one end of the first lower roll shaft andis connected with a motor through a drive chain; the upper roll shaft is arranged above the middle parts of the first lower roll shaft and the second lower roll shaft; the two ends of the upper roll shaft are installed in mounting grooves on the supporting seat frames through sliding bearing seats respectively; and the roll surface of the upper roll shaft is a convex arc surface, corresponding tothe concave arc surface.