Underground water quality monitoring and sampling device

The invention relates to an underground water quality monitoring and sampling device. The device comprises a filter cartridge and a sampler, the filter cartridge comprises an outer cartridge and an inner cartridge, a plurality of filter holes are formed in the peripheral wall of the outer cartridge, filter elements are arranged in the filter holes, a cover capable of sealing an opening in the upper end of the outer cartridge is hinged to the upper end of the outer cartridge, a U-shaped groove is formed in the upper end of the inner cartridge, and a plurality of water passing holes are formed in the peripheral wall of the inner cartridge. A water drainage hole is formed in the top surface of the inner cartridge, a plurality of inclined through holes are formed in the peripheral wall of the inner cartridge, the inner end of each inclined through hole is communicated with the water drainage hole, the sampler comprises a positioning rod, a plurality of sampling bottles and a water pump, and when the sampler is ar