A respirator fixing module applied to a breathing tube includes a cap, a nasal mask structure, a first strap, a second strap, and a third strap. The cap has a first joint； the nasal mask structure has a nasal mask, two first assembling members and a second assembling member extending from the left, the right, and the top sides of the nasal mask respectively, and a communicating pipe and a breathing tube connected to each other； the first strap is installed between the two first assembling members and encircled into a headband； the second strap is connected to the cap, and the second strap has an end surrounding the breathing tube and a second joint adjustably combined with the first joint； and the third strap has an end fixed to the second assembling member and the other end having a third joint adjustably combined with the first joint.
