Underground water layered monitoring well and well completion method thereof

The invention discloses an underground water layered monitoring well and a well completion method thereof, and relates to the technical field of underground water environment monitoring. The monitoring well comprises a plurality of monitoring well pipes and a plurality of permeable cavities; the monitoring well pipe comprises a monitoring well pipe upper section and a monitoring well pipe lower section, the monitoring well pipe upper section is designed into a plurality of subsections according to the length, and the adjacent subsections are connected through monitoring well pipe joints; the monitoring well pipe lower section is connected with the lowest monitoring well pipe upper section in a subsection manner; the monitoring well pipes are distributed on the peripheral side of the permeable cavity; the monitoring well pipe is communicated with the permeable cavity; a plurality of water inlet holes are formed in the side surface of the permeable cavity; each aquifer to be detected is provided with a permeabl