The utility model relates to a longitudinal limiting device used for rotation equipment. A limiting catch wheel is a cone body, limiting rings are the steel rings fixed on a cylinder of the rotation equipment, the conical degree of the limiting ring is consistent with that of the limiting catch wheel, and the limiting catch wheel is arranged in a trapeziform groove formed by the two limiting rings. A group of two bearings at the upper end of a catch wheel shaft are fixed in the limiting catch wheel, a group of two bearings at the lower end of the catch wheel shaft are fixed in a through hole bearing seat, and the limiting catch wheel and the catch wheel shaft are in double rotation style that both the wheel and the shaft can rotate. The structure can effectively restrict the longitudinal displacement of the rotation equipment, avoid high-speed temperature rising of the bearings and prevent the sudden fault of the limiting device. The longitudinal limiting device can be applicable to longitudinal limiting for the rotation equipment such as high-speed centrifuge injection molding machines, cylinder type slag coolers and cylinder type drying machines.