The invention discloses a pipeline device for automatically avoiding engine cylinder water trapping and discharging foreign matter. The pipeline device comprises an intermediate pipeline, an ECM and awarning sounder. An inlet pipeline and an outlet pipeline which are integrally formed with the intermediate pipeline are separately fixed to the two ends of the intermediate pipeline, and the intermediate pipeline, the inlet pipeline and the outlet pipeline communicate with each other. A sleeve is fixed to the inner wall of the inlet pipeline, and a water immersion sensor is fixed to the center of the inner wall of the sleeve. The sleeve cross section from both sides of the water immersion sensor to both ends of the sleeve is in an inverted platform shape. A blower is arranged at the position, beside the inlet pipeline, at the upper end of the intermediate pipeline, and an air outlet pipe is fixed between an air outlet of the blower and the intermediate pipeline. The air outlet pipe communicates with the interior of the intermediate pipeline through an air outlet formed in the pipe wall of the intermediate pipeline. A material discharging pipe is fixed to the position, beside the inlet pipeline, at the lower end of the intermediate pipeline, and the material discharging pipe communicates with the interior of the intermediate pipeline through a feeding inlet formed in the pipe wallof the intermediate pipeline. The pipeline device is good in using effect and high in efficiency, has two layers of protection, the barrier is more secure, and accumulated sand, stone and dirt can beremoved.