The utility model provides an opening flattening machine structure, and relates to the technical field of production equipment of freshness preservation bags. The opening flattening machine structure can improve the processing efficiency of the freshness preservation bags greatly. The opening flattening machine structure comprises a machine frame. The machine frame is provided with a conveying belt, and a material supporting frame is arranged at one end of the machine frame. The machine frame is provided with a driving roller, a sealing cutter and a cutter sequentially. The opening flattening machine structure is characterized in that the material supporting frame is provided with an upper material winding shaft and a lower material winding shaft, the upper material winding shaft and the lower material winding shaft comprise a left material winding shaft and a right material winding shaft on the two sides respectively, the machine frame is provided with an upper driving roller and a lower driving roller, the upper driving roller and the lower driving roller comprise a left driving roller and a right driving roller on the two sides respectively, the left driving roller and the right driving roller correspond to the left material winding shaft and the right material winding shaft respectively, the sealing cutter comprises an upper sealing cutter body and a lower sealing cutter body, and the upper sealing cutter body and the lower sealing cutter body are respectively arranged on the machine frame.