The utility model relates to an impact sprinkler which can automatically change the spraying distance.A runner is arranged above the frame of a sprinkler.The upper end face of the runner forms an inclined ring surface.In addition, a water pressure plate is pivoted in front of the sprinkler frame.The back end of the water pressure plate is against the inclined ring surface of the runner.When the wheel is driven to rotate by a swinging frame of the sprinkler,The water pressure plate is pushed by the inclined ring surface.Make the front end of the water pressure plate swing up and down.So when the ejected water reaches the front end of the water pressure plate of the lower pendulum,It can impact the water pressure plate and refract towards the near ground.On the contrary, when the front end of the water pressure plate swings upward,The water is not blocked.Spray to the far ground.一種可自動改變灑水距離的撞擊式灑水器，其係在一灑水器的框架上方設有一轉輪，轉輪的上端面形成一斜環面，另外在灑水器的框架前方樞接一壓水板，壓水板的後端抵靠在轉輪的斜環面上，當轉輪被灑水器的一擺動架帶動旋轉時，再由斜環面推動壓水板，使壓水板前端上下擺動，因此當噴出的水到達下擺的壓水板前端時，能夠沖擊到壓水板再向折射噴向較近的地面，反之壓水板前端上擺時，噴出的水不受阻擋，噴到較遠的地面。
