The invention discloses a medical portable anus dilatation device which comprises a case, a first rod and a handle, wherein the top end of the case is an opening; the bottom end of the case is a bottom opening; a groove opening is formed in one side of the case; one side of the bottom end of the case is in fusion connection with the handle; a round hole is formed in the handle; the top end of thefirst rod is fixedly connected with a small expansion ball; the bottom end of the first rod is fixedly connected with a position limiting plate; the middle position of the bottom end of the position limiting plate is fixedly connected with the top end of a second rod; the bottom end of the second rod is fixedly connected with the bottom plate; a hollow groove is formed inside each of the first rodand the second rod; each hollow groove is connected with the small expansion ball through a passage; each of the case, the first rod, the second rod and the handle is made of polypropylene materials;the small expansion ball is made of polyamide materials; the hollow groove inside the first rod and the hollow groove inside the second rod communicate with each other; one end of each hollow grooveis connected with an air pump through a pipeline; and the case is of a funnel-shaped structure. The medical portable anus dilatation device has the advantages that the structure is simple; and the operation is convenient.