Urethral catheterization device

The utility model discloses a urethral catheterization device which comprises an outer sleeve inserted into the urethra of a patient, and the top end of the outer sleeve enters the bladder of the patient; the adjusting tube is inserted into the inner cavity of the outer sleeve and can move relative to the outer sleeve, and the top end of the adjusting tube can be expanded so that the adjusting tube cannot be separated from the bladder; the catheter is fixed on the inner cavity of the adjusting tube, no gap exists between the outer wall of the catheter and the inner wall of the adjusting tube, and a first urine inlet hole is formed in the top end of the catheter; the matched underpants assembly comprises hard underpants worn on the body of a patient and a connecting plate fixed to the outer wall of the outer sleeve and capable of being connected with the hard underpants, the hard underpants are provided with a round hole allowing the outer sleeve to penetrate through, the outer wall of the round hole is provid