The CG-00 water quality sampler is suitable for water sampling carried out by environmental protection agencies and other groups that analyze water quality and plankton levels. The CG-00 water quality sampler is made of a high intensity and high polymer engineering material through the integration of an injection molding process to ensure it is resistant to impact, aging and corrosion. The sampling container is clear and colorless with an automatic opening and closing of a movable flap on the bottom to achieve water sampling at the target depth.