Filling pipeline control system and control method

The invention discloses a filling pipeline control system and method, the filling pipeline control system comprises a main pipeline, a drainage pipeline, a grouting branch pipeline and a control switching device, the main pipeline comprises a first port, and the main pipeline is suitable for introducing one of water and slurry; the drainage pipeline comprises a first water inlet; the grouting branch pipeline comprises a slurry inlet; the control switching device comprises a switching assembly and a control assembly, the switching assembly selectively communicates the first opening with one of the first water inlet and the slurry inlet, the control assembly comprises a light emitter, a light receiver and a controller, the light emitter and the light receiver are both arranged in the main pipeline, the light emitter corresponds to the light receiver, and the controller is arranged in the main pipeline. The light receiver is electrically connected with the controller so that the light receiver can transmit light