The invention relates to the technical field of printing, and particularly discloses ultraviolet offset printing continuous machine white ink and a preparation method thereof. The ultraviolet offset printing continuous machine white ink is prepared from, by mass, 15.0%-25.0% of polyester acrylate oligomer, 10.0%-20.0% of thermoplastic acrylic resin, 40.0%-50.0% of titanium dioxide, 2.0%-3.0% of a dispersing agent, 3.0%-5.0% of a photoinitiator and 10.0%-20.0% of monomers. According to the ultraviolet offset printing continuous machine white ink, the covering power of traditional ultraviolet screen printing ink is compatible with the high-speed printing characteristics of ultraviolet offset printing ink, not only is the covering effect of the UV screen printing ink achieved, but also the high-speed cooperating requirement of the UV offset printing ink is achieved.