A prostate expander tube is disclosed, comprising a main tube; a balloon injection chamber and a main tube are disposed in the main tube; the balloon injection chamber and the main tube have a balloon injection port and a tube inlet port respectively; and the balloon injection port and the tube inlet port respectively communicate with the balloon injection chamber and the main tube. The balloon injection chamber and the main tube have a balloon at the front end; the balloon and the balloon front end of the main tube are transparent; the present invention has a simple structure, easy to use, the balloon and the balloon front end of the main tube are transparent, the main tube and the balloon are designed in cooperation with the endoscope, ensuring the convenience of using the endoscope, and improving the endoscopic observation field. The idea of the product greatly reduces the discomfort of the product and reduces the risk of surgery when used with an endoscope.