The invention discloses a portable food detection method, which comprises the following steps: S1, putting food to be detected into a mixing barrel on a rotating frame, and adding an extracting solution into the mixing barrel at the same time; s2, stirring the extracting solution and the food sample through a driving and mallet pounding mechanism, so that the food is fully dissolved in the extracting solution; and s3, discharging the stirred solution into a filter cartridge through a stalling discharging mechanism for storage. The portable food detection method is scientific and reasonable in structure and safe and convenient to use, the driving and mallet pounding mechanism is arranged, a driving motor and a guide wheel are matched to drive the mixing barrel to rotate, an extracting solution and food in the mixing barrel are rotationally stirred, the mixing effect is improved, the food is conveniently dissolved in the extracting solution, sampling is convenient, meanwhile, through the cooperation of a driving gear and a driven gear, in the rotating process of the mixing barrel, a screw rod is driven to rotate, a reciprocating plate ascends along the screw rod to be attached to a top plate, a travel switch is started, and a driving motor rotates reversely.