In clinical practice, the procedure of urinary catheterization may cause severe irritation to urethra and bladder. In addition, physiological and pathological stricture and curvature of human urethra will increase the difficulty of urinary catheterization and aggravate the injury of lower urinary tract during insertion. The injury of lower urinary tract may induce or aggravate lower urinary tract infection and further affect the lower urinary tract or even the systemic organ function. At present, clinical solutions to urethral stricture comprise: The use of a stronger tip or metal probe or guide wire increases the external force to push forward, resulting in severe contusion of the urethra intima and susceptibility to infection; another method is to coat the outer surface of the urinary catheter with lubricating oil or lubricant coating, but using it alone is almost ineffective for urethral stricture. The utility model provides a stricture-dilated urinary catheter, which can be used for filling the dilatable part of the catheter tip thin segment in a targeted manner during the insertion, and with the uniform coating of lubricating substances, thereby improve the success rate of the insertion and minimize the risk of injury and infection.