A kind of Backpack type grass trimmer band structure improvement,It include: a master tape body； The flexible belt body of the one connection what master tape body lower end,The flexible belt body has the fixing end of a connection what master tape body and the free end of a different what fixing end； The same face what of the flexible belt body is close to the fixing end and sets one respectively close to the position of the free end and opposite can combine or one of separation the first engaging member and one second engaging member； The flexible belt body passes through two button holes Hou of a grass trimmer central siphon with the free end,It folds to the direction of the fixing end,And opposite two the first engaging members and the second engaging member are combined,The flexible belt body circlewise hangs the central siphon.一種肩背式割草機揹帶結構改良，包括：一主帶體；一連接於該主帶體下端的撓性帶體，該撓性帶體具有一連接於該主帶體之固定端和一相異於該固定端之自由端；該撓性帶體的同一面於接近該固定端和接近該自由端的位置分別設一可相對結合或分離之一第一結合件和一第二結合件；該撓性帶體以該自由端穿過一割草機軸管之二扣孔後，向該固定端之方向摺疊，並使相對的兩個第一結合件和第二結合件結合，該撓性帶體成環狀吊掛該軸管。
