The invention relates to a dicer, in particular to a foamed plastic dicer, and aims to provide the foamed plastic dicer which is convenient to operate, high in dicing efficiency and uniform in dicing. In order to solve the technical problem, the foamed plastic dicer comprises a bottom plate, supporting rods, a collecting frame, a right rack, an operating table, a rocking handle, a circular gear, a left rack, a bearing block, a first rack, a fixing plate, a first slider and the like; the supporting rods are symmetrically welded to the left and the right of the middle of the top of the bottom plate; the upper ends of the supporting rods are welded with the operating table, the right rack is welded on the right side of the top of the bottom plate, a top plate is welded at the upper end of the right rack, and the left side of the bottom of the top plate is connected with an electric push rod by a bolt. A rotating motor drives a fan-shaped gear to rotate, the fan-shaped gear drives a second rack to move vertically, the second rack drives a blade to move vertically, and the blade dices foamed plastic.