Abstract: A pistol nozzle of lawn sprinkler including a handle, a barrel, and a water control device. The handle is provided with a water admitting channel, whereas the barrel is provided with a water discharging channel. The water control device is disposed at the juncture of the water admitting channel and the water discharging channel. The water control device includes a valve rod which is provided with a piston to control the discharge of water by the barrel.