In the use of PVC lay flat hose, the rocker nozzle plays an important role. It is above the PVC lay flat hose. When a set of rocker pressure water with a deflector and a deflector at the front is ejected from the nozzle of the nozzle, it impacts the deflector through the deflector, causing the rocker arm to produce tangential movement force and rotate around the cantilever for an angle. Then it returns and strikes the nozzle under the action of the torsion spring Turn the nozzle at an angle, and repeat it so that the nozzle can rotate in the whole circle. If a limit device and a reversing mechanism are added to the spray nozzle to make the spray nozzle rotate at a certain angle, the fan-shaped spray irrigation can be carried out.