The invention discloses a seamless butt joint type ultrathin LED glass screen. The glass screen comprises a first glass screen body, a second glass screen body, a third glass screen body and a fourth glass screen body, seam splicing structures are arranged among the first glass screen body, the second glass screen body, the third glass screen body and the fourth glass screen body, and the first glass screen is formed by sequentially arranging a light guide plate, an optical film, a first polarizing plate, a first glass substrate, a first color filter, a second alignment film, liquid crystals, a first alignment film, a second color filter, a second glass substrate, a second polarizing plate and a glass outer plate. According to the seamless butt joint type ultrathin LED glass screen, the problem of gaps of a traditional LED glass screen is effectively solved, the phenomenon that the gaps affect picture projection is avoided, the comfort degree of people for watching pictures is improved, butt-joint installation of the LED glass screen is facilitated, installation convenience is greatly improved, and a fixed mounting tool does not need to be customized according to the size of the LED glass screen, so that the glass screen is higher in applicability.