Positioning measuring rod for river water quality sampling

The utility model discloses a positioning measuring rod for river water quality sampling, which is used for pulling a sampling ship and a sampler, and the sampler is suspended on the sampling ship through a first stay wire with adjustable length and immersed in a river; comprising a second rope winder, and a second stay wire wound on the second rope winder is connected to the sampling ship; a third stay wire wound on the third rope winder is connected to the sampler; vertical projections of wire outlets of the second rope winder and the third rope winder on the protractor coincide at the original point of the protractor, and indicating scales of the second pull wire and the third pull wire on the protractor are an included angle beta between the first pull wire and the positioning measuring rod and an included angle alpha between the third pull wire and the positioning measuring rod. The device can be applied to various field environments, has good applicability, can be used for assisting a sampler to be loca