The utility model belongs to the technical field of electrochemical detection, and particularly relates to a portable device for rapidly detecting phosphate in a water body on site. Comprises a handheld pipettor, a miniature electrolytic cell, a trace pipette and an electrode system, wherein the handheld pipettor and the trace pipette are respectively connected with two ends of the miniature electrolytic cell, and a complexing agent is arranged in the trace pipette; One end of the electrode system is connected with the miniature electrolytic cell, and the other end is connected with an external electrochemical detection device; The miniature electrolytic cell comprises a cell body and a miniature electrolytic cell inner cavity arranged in the cell body, wherein an upper through hole and a lower through hole which are communicated with the miniature electrolytic cell inner cavity are arranged at two opposite ends of the cell body, and a hand-held pipettor is arranged at the upper through hole; The lower through hole is provided with a micro pipette. According to the invention, the handheld pipettor is hermetically connected with the trace pipette through the miniature electrolytic cell, the operation is simple and convenient, the carrying is convenient, the cost is low, and the method can be widely applied to the detection of phosphate in environmental water bodies such as wastewater, fresh water, seawater and the like.
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