The utility model relates to a multifunctional fixing strap for fixing a noninvasive ventilation nose or a mask. The multifunctional fixing strap is provided with a fixed structure capable of clinging to a headrest part and providing a support force, and flexible connection structures capable of connecting the fixed structure with the ventilation nose or the mask, wherein the fixed structure can be various structures capable of clinging to the headrest part and in the shapes of a circle, an ellipse, a triangle, a quadrangle and the like, and the corresponding size of the fixed structure can be adjusted according to head characteristics; the connection ends of five connection structures are arranged on the fixed structure, and the flexible connection structures and the connection ends with different quantities are determined according to connection requirements on various ventilation noses or masks, thus ensuring that various ventilation noses or masks with different sizes, shapes and connection requirements are fixed.