Water quality sample collector

The utility model provides a water quality sample collector which comprises a barrel (10), and openings are formed in two ends of the barrel (10); a filter screen (11) and a blade type one-way valve (12) are arranged at an opening in the bottom end of the barrel (10), the blade type one-way valve (12) is located above the filter screen (11), and the filter screen (11) is used for filtering impurities in water; and the blade type one-way valve (12) can be opened under the action of water flow and is sealed under the action of gravity of water. According to the water quality sample collector provided by the utility model, the filter screen is arranged at the bottom opening, so that the water sample is filtered in the collecting process, the subsequent work is simplified, and the representativeness of the water sample is also ensured. The blade type one-way valve can enable the water body to smoothly enter the barrel body, meanwhile, the water body is guided to ascend in a slow rotation mode, water samples on th