Water quality detection sampling device

The utility model discloses a water quality detecting and sampling device, which relates to the field of water quality detecting and sampling devices and comprises a sampling outer tube, when a handheld rod is held by hand, the sampling outer tube can be placed in water, then a suction unit is started, and gas in a gas bag is pumped out. Water of different water layers outside the sampling outer pipe is sucked into different sampling grooves through the multiple sets of external connection pipes, the purpose of sampling different water layers is achieved, the external connection pipes and the sampling grooves are communicated and sealed conveniently, the pushing plate can be controlled to move through the pushing unit, the external connection pipes are inserted into the middle holes, the control valve can control opening and closing of the external connection pipes, and use is convenient. When the sampling inner pipe in the sampling outer pipe is taken out, the external connecting pipe can be controlled to mo