Abstract: A rotatable positioning nozzle contains: a body. The body includes an intake, a spray hole defined opposite to and communicating with the intake, and an engagement groove defined adjacent to the intake. A diameter of the intake decreases, and a cross section of the engagement groove is circular. The engagement groove has an inward shoulder proximate to the intake, an outward shoulder adjacent to the spray hole, multiple limiting recesses surrounding the engagement groove proximate to the inward shoulder, and multiple defining protrusions. A respective one defining protrusion protrudes from two sides of a respective one limiting recess, and the body further includes a second central dotted line defined on a center thereof. The spray hole has a third central dotted line defined on a center thereof, and an angle is defined between the second central dotted line and the third central dotted line.