A sprinkler includes a main body and a duct rotary unit rotatably sleeved at the main body, wherein the duct rotary unit includes a plurality of nozzles with different spraying patterns. A baffle is formed on top of the duct rotary unit and is stationary when the duct rotary unit is rotated, such that when the duct rotary unit is rotated, the baffle is stationary and is aligned with one of the nozzles as a selected nozzle for spraying operation.