The utility model belongs to the field of environmental monitoring, and particularly relates to a portable automatic depth-setting water quality sampler. The top end of the valve core linkage rod is connected with a traction wire, the tail end of the valve core linkage rod is connected with a traction rope, the balance weight is connected with a traction rope, and the traction wire is provided with a movable positioning floater. An air inlet, an exhaust valve, a valve core linkage rod and an air inlet and outlet valve are arranged between the valve core linkage rod and the air inlet and the air outlet. The water collecting tank is automatically opened in the preset water depth, the exhaust valve and the water inlet and the drain valve are realized by pulling the traction rope to realize the closing of the air inlet, the exhaust valve and the water inlet and the drain valve. The utility model discloses can automatic accurate location preset water degree of depth and collect the water sample, effectively prevent the sample thief to mix the water sample of different depths when putting, collect. The utility model has the advantages of strong automation, convenient putting and use.
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