Prostate dilation device

The utility model provides a prostate expanding device, and relates to the field of medical instruments. The prostate dilation device comprises a main body which is provided with a guiding section, a dilation section and a conveying section which are connected in sequence; the bag assembly is arranged on the expansion section, and the bag assembly comprises an outer bag and a plurality of sub inner bags which are located in the outer bag and are independent of one another; when the bag assembly is in a use state, the sub inner bags are connected with one another, and the outer walls of the sub inner bags abut against the inner wall of the outer bag, so that the outer bag is of a columnar structure; and the catheter assembly is arranged in the main body. The outer bag can be accurately positioned between the bladder and the tip of the prostate of a patient by controlling the multiple independent sub inner bags, that is, accurate positioning of the expanding device in an operation is achieved, so that the opera