Multi-point water quality sampling instrument and sampling method thereof

The invention relates to the technical field of water sample collection, and particularly discloses a multi-point water quality sampling instrument and a sampling method thereof. The multi-point water quality sampling instrument comprises a power mechanism, a sampling mechanism and a storage mechanism, the power mechanism provides power for the sampling mechanism, and the storage mechanism stores a water sample taken by the sampling mechanism; wherein the sampling mechanism comprises a transmission part, a sampling piston, an external water inlet and a sampling pipe, the transmission part is connected with the power mechanism and the sampling piston, the sampling piston is arranged in the sampling pipe, the bottom of the sampling pipe is in a non-closed state, the transmission part drives the sampling piston to move in the sampling pipe, and the top of the sampling pipe is communicated with the external water inlet; the storage mechanism comprises a plurality of water storage bottles, and the sampling water o