The protector is comprised of a bag which is made of an appropriate sterile material in order to form a bedding for the catheter and act as a barrier against environmental microorganisms. The bag is adapted to house internally any type of catheter and incorporates at the vicinity of its mouth an adhesive strip as an extension of its front face. The strip constitutes a means for fixing the protector to the patient body as well as a means for closing and sealing the catheter bag. Said strip is a pressure adhesive strip comprising wax-treated, silicone-treated or similar protection paper sheets which can be removed for the fixing thereof to the patient body.