The invention relates to the field of fluid machinery, in particular to a multistage centrifugal pump guide blade, and mainly solves the problems of increment of the hydraulic loss of a centrifugal pump and reduction of the water pump efficiency in a traditional multistage centrifugal pump guide blade. The multistage centrifugal pump guide blade comprises a front cover plate, a back cover plate, a forward guide blade and a reverse guide blade; the forward guide blade is positioned between the back cover plate and the front cover plate, and is arranged on the frontal surface of the back cover plate; the reverse guide blade is arranged on the back surface of the back cover plate; a gap is formed between the forward guide blade and the front cover plate; a connecting rib plate is arranged at the tail end of the forward guide blade; the front cover plate and the back cover plate are connected through a connecting rib plate; the back cover plate is provided with a flow passing channel in a tail end outlet of the forward guide blade; and a fluid flows into a reverse guide blade runner from a forward guide blade runner by the flow passing channel.