Intelligent pre-warning system and pre-warning method for leakage of drainage-free channel-penetrating river-crossing pipeline

The invention discloses an intelligent early warning system and early warning method for leakage of a drainage-free through-channel river-crossing pipeline, and the system comprises an upstream inspection well disposed at the upstream of the to-be-detected through-channel river-crossing pipeline and a downstream inspection well disposed at the downstream of the to-be-detected through-channel river-crossing pipeline, and submersible pumps are disposed below the upstream inspection well and the downstream inspection well. The submersible pump is arranged below the liquid level in the channel-crossing and river-crossing pipeline to be detected; a water outlet pipe of the submersible pump penetrates through the inner wall of the upstream inspection well or the downstream inspection well and is connected with a water inlet of the corresponding phytoplankton detection system; according to the method, the situation of river water infiltration is analyzed according to the special environmental conditions of the chann