The invention discloses a portable drainage device fixing belt, which structurally comprises a waist fixing belt, a strap, a catheter fixing ring, a hook, a transparent observation bag, an elastic belt, a magic tape and a buckle, wherein the outer side of the top of the waist fixing belt is sewn with the strap, the catheter fixing ring is fixed at the middle side of the front part of the strap, the hook is arranged at the front part of the waist fixing belt, and the transparent observation bag is fixed at the front side of the bottom of the waist fixing belt. By arranging a drainage bag in thetransparent observation bag, a patient with the drainage bag can move out of the bed with holding the drainage bag in a hand; the hook on the waist fixing belt can effectively fix the drainage bag; the catheter fixing ring is arranged on the strap, a drainage pipe can be prevented from slipping off, the drainage situation can be observed, so that the exposed part of the drainage pipe is guaranteed and is not easy to drag, therefore the purpose of protecting the drainage pipe is achieved, the unplanned pipe pulling rate of drainage pipe is effectively reduced.