The utility model discloses a food acid -base nature detection device, including the agitator main part, the upside of agitator main part is provided with the bung, the side has the axis of rotation in the bung, the both sides of axis of rotation are equipped with the stirring shovel, the downside of stirring shovel is provided with the motor, the downside of agitator main part sets up organic case, the downside of machine case is provided with the load board, the upside of load board is provided with the piston control case, the left side of piston control case is provided with the piston, the piston through the water -drain mast with deposit water tray and be connected, it is connected through the drainage tube and the bag that absorbs water to deposit water tray, it is provided with observation box as a result to absorb water the right side of bag, this kind of food acid -base nature detection device, and structural design is simple, adopts the jar formula of standing design, and the principle of utilizing mycotoxin to present different acid -base natures uses coordinately with the pH test paper, and the effect is more directly perceived, is convenient for observe and control, satisfies the operation requirement that the fungi detected.