Water quality detection sampling system

The utility model discloses a water quality detection sampling system which comprises a controller, a probe rod, a floating body, a lifting adjusting unit, a sampling box, an air inlet and outlet electric valve, a vacuumizing pump, a water inlet and outlet electric valve and a water depth sensor, the probe rod is inserted into water to be sampled and is kept in a vertical posture through buoyancy support provided by the floating body; the sampling boxes are arranged on the probe rod through the lifting adjusting units, and the water depth positions of the sampling boxes can be adjusted through the corresponding lifting adjusting units; the vacuumizing pump exhausts air to enable the interior to be in a negative pressure or vacuum state; the sampling box measures the water depth position through the water depth sensor. The water quality detection sampling system provided by the utility model can complete water quality sampling at different water depths at one time, so that the sampling efficiency is improved.