An impingement sprinkler is provided wherein the first and second limiting pieces of the rotation limiting mechanism are configured with first and second stopping portions extending along the swinging path. As such, when the main body slants upward or downward, the poking rod portion can always contact the first and second stopping portions. Therefore, the first or second limiting pieces can interfere with the poking rod portion and maintain the function of the main body to shift turning directions. In this way, no matter whether the main body slants upward or downward, it can substantially execute the turning action to sprinkle the surroundings. Hence, the practical utility and usage convenience of the product is greatly enhanced.