The invention relates to a splice plate which is used to connect two cable tray sections, whereby each section comprises longitudinal warp wires and transverse weft wires (24). The inventive splice plate comprises: an elongated base (2); a lateral flange, known as the upper flange (4), which extends essentially perpendicularly to the base (2) from a first longitudinal edge of same; and a lateral flange, known as the lower flange (6), which extends essentially perpendicularly to the base (2) from the longitudinal edge opposite the first longitudinal edge. Each of the two flanges (4, 6) is equipped with a notch (8, 14) that opens at the free edge of the corresponding flange (4, 6), said two notches (8, 14) being disposed facing one another. The upper lateral flange (4) comprises coupling means (12) on either side of the notch (8), which are intended to co-operate with a warp wire (26) of a cable tray section (20).