A standing seam roll forming machine is used to make standing seam metal roofing panels. These machines create double-standing seam locks for the roofing panels. These roofing panels are subsequently used to install the double-standing seam roofing. The self-lock roof sheet occlusal system is applied to sloping roofs and curved roofs. The overall structural waterproof and drainage functions can completely occlude the joints regardless of the shape of the building, and the entire roof has no nail holes, which can make the roof expand and contract freely when the temperature changes, avoid temperature stress, and eliminate the hidden danger of water leakage caused by the system screw fixing method; good air permeability, maintain the long-term natural drying of the overall structure, and prolong the service life of the building. Profiles and size are customized as per customers' requirements.