The invention relates to a method and a device capable of measuring
water level and in-situ dissolved
oxygen and collecting underground water at different depths. A dissolved
oxygen meter probe is combined with a
water collection pipe for performing in-situ observation on dissolved
oxygen in underground water at different depths, and the content of dissolved oxygen in a
water sample transferred from the
water collection pipe into a sampling
bottle is prevented from being changed. An opening / closing state of a water inlet cover of the
water collection pipe is controlled according to the difference of
rope descending speeds on parts of different diameters on a reel. A three-legged support is fixed on an observation well, a valve of a water outlet of the water collection pipe is closed, and the water inlet cover of the water collection pipe is covered. The reel is rotated, so that the water collection pipe descends, and when a pointer of a microammeter deflects, a catch bolt is screwed, and then the
water level of underground water is obtained; a switch of a battery box is switched off, the catch bolt is loosened, the reel is continuously rotated until the water inlet of the water collection pipe reaches specified depth, the catch bolt is screwed, and the content of dissolved oxygen is recorded; the water inlet cover is opened through a pull
rope, and the reel is rotated to take out the water collection pipe after the water collection pipe is full of water. The device has the characteristics of simple operation, high efficiency,
energy conservation, high accuracy, low cost and the like. The
voltage of a used battery and the range of the microammeter can be adjusted according to the contaminated situation of underground water.