Prostate expansion catheter with visual precise positioning function

The invention relates to a prostate expansion catheter, in particular to a prostate expansion catheter with a visual precise positioning function. A main body of the prostate expansion catheter is an expansion catheter body provided with a urethral catheterization opening in the front end, and the urethral catheterization opening is communicated with an expansion catheter internal tube; the periphery of the expansion catheter body is sleeved with a fixing bag and an expansion bag in sequence from front to back, wherein the fixing bag is used for fixing the expansion catheter body into the urethra, and the expansion bag is used for expanding the urethra; the periphery of the expansion catheter body is further provided with a positioning sleeve which movably sleeves the expansion bag and can move axially relative to the expansion catheter body; a fixing bag communicating cavity and an expansion bag communicating cavity are formed in the expansion catheter body, wherein the front end of the fixing bag communicat