Water sample collection system. The utility model relates to a hydrology measuring equipment field, include shell subassembly, inside lining subassembly, pull subassembly and a pair of subassembly of opening and close, the utility model discloses during the use, the water sample of the appointed degree of depth will get into the kickboard below from bottom to top by the inlet opening, and the water sample draws and accomplishes the back, the retaining space of will form between kickboard, water storage barrel and balancing weight independently, sealing, make water sample collection system can't sneak into at last shallow water in vogue, have the position of collection accuracy and do not have the characteristics that the shallow water was sneaked into. And the pure mechanical structure of present case also has that the structure is exquisite, convenient to use and stable good characteristics under water. The utility model discloses consider still that the exhaust of appointed depth of water department is smooth, slow scheduling problem is crossed to the speed of absorbing water, in the venthole of water storage barrel top setting to has designed and has opened and close the air lock of subassembly linkage, effectively solved above -mentioned problem, have the water sample draw fast, work efficiency is high, convenient to use's characteristics.