The utility model discloses a liquid phase atomic force microscope probe, successively comprising a photoelectric detection system consisting of a laser and a position sensitive device (PSD); a scanning and feedback control system consisting of XYZ piezoelectric ceramic, a gas-liquid isolating plate and a micro-cantilever probe; a liquid phase unit that can rise and fall consisting of a sample, a specimen holder, a liquid pond and an elevating table. The liquid phase atomic force microscope probe of the utility model is simple in structure, easy to be realized technologically and widely suitable for the real-time measurement and observation of a conductor, a semiconductor and an insulator sample in air, liquid or even electrochemical environment. Thus it may find its wide application in various fields of science, technology and industry.