A computer monitor screen has a screen lens, a connection seat having an upper rack and a lower groove, a pair of hanging mounts, and a plurality of fastening devices. The screen lens has a plurality of through holes. The connection seat further has a plurality of through apertures to match the through holes of the screen lens. Each of the hanging mounts has a slide slot to receive the upper rack. The screen lens is inserted in the lower groove of the connection seat. Each of the fastening devices passes through the corresponding through aperture of the connection seat and the corresponding through hole of the screen lens to fasten the connection seat and the screen lens.