An adjustable sprinkler includes a base and a mobile tube. The base has a vertical water way and a transverse axle tube linked to an upper end of the vertical water way. The transverse axle tube has at least one water outlet. An axial water way and a water outlet are formed to an end of the mobile tube, a transverse axle hole connected the water way is formed to the end also. The transverse axle tube can be received by the transverse axle hole. An inner wall of the transverse axle hole has the same quantity of protrusion with the water outlets of the transverse axle tube. The protrusions will be rotated to cover the water outlets. Another end of the mobile tube has an extension portion bent downwards.