The utility model relates to a steel technical field, more specifically say and relate to a roofing herringbone encircles heterotypic section structure, including the board of rolling up, roll up board, t -shaped plate and pipe down, the board of rolling up is rolled up the board and is rolled up the board with the right side including a left side, t -shaped plate includes pterygoid lamina and web, the web lower extreme sets firmly on the pterygoid lamina, a left side is rolled up the board and is set firmly with right side book board the pterygoid lamina top the web both sides, under roll up the board and set firmly pterygoid lamina below, and its both ends with pterygoid lamina both ends fixed connection, the pipe sets firmly the web upper end. This structural modeling is novel, and the structure is firm.