Speed control system and method for reducing interlayer difference of reel sprinkler

According to the speed control system and method for reducing the interlayer difference of the reel type sprinkling machine, the rewinding radius of a reel is determined by monitoring the length of a remaining PE pipe in the operation process of the reel type sprinkling machine in real time, then the rotating speed of a direct current motor is calculated, and a sprinkler wagon is kept to advance at a constant speed. When the length of the remaining PE pipe is not changed, the sprinkler wagon cannot be normally dragged, and an alarm signal can be sent to inform a user of a system fault; when the length of the remaining PE pipe is smaller than a certain distance, an alarm signal can be sent out to inform a user that sprinkling irrigation operation is about to be completed, and when the length of the remaining PE pipe is smaller than a limit distance, automatic shutdown can be achieved. The uniformity of sprinkling irrigation operation of the reel sprinkling irrigation machine is improved, the dependence of a un