The invention discloses a hoop buckle slab processing machine which comprises a rotary plate. The rotary plate comprises a disc-shaped plate body, a plate hole is formed in the center of the plate body, and a die column array composed of cylindrical die columns is arranged in the circumferential direction of the periphery of the plate body. An extrusion support is arranged on the plate body and comprises a square-frame-shaped support body, the two sides of the support body are each provided with a long-strip-shaped support transverse bar, the tail end of each support transverse bar is provided with a U-shaped extrusion die groove, and the extrusion die grooves are matched with the die columns. A rotatable driving support is arranged in the plate hole and comprises a driving shaft and an eccentric plate. A user installs hoop buckle slabs needing to be processed onto the die columns, the whole extrusion support starts to intermittently rotate by means of matching of the eccentric plate and the support body, the extrusion die grooves extrude the die columns, and thus the hoop buckle slabs are extruded to be in an arc shape rapidly and conveniently, and consistency is good.