The invention discloses a heat exchange plate piece which comprises a plate body; a first fluid opening and a second fluid opening are formed in the two ends of the plate body correspondingly; and the surface of the plate body is pressed into a concave and convex alternative structure. When a plurality of plate bodies are superposed, convex parts of adjacent plate bodies are closely fitted for strengthening rigidity of the plate bodies which are superposed together; and concave parts of adjacent plate bodies form a fluid runner. The heat exchange plate piece is large in effective heat transfer area, high in heat transfer efficiency and good in supporting property.