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