The invention relates to a flat-plate three-dimensional locating/scanning device based on a piezoceramics tube. The structure component of the invention mainly includes a rectangle fixing frame, eight piezoceramics tubes, sixteen insulating sheets, eight elastic sheets, four fixing seats and a sample platform. The two ends of each piezoceramics tube are stuck with one insulating sheet. The insulating sheets arranged at one end and the piezoceramics tubes are fixed on one fixing seat of the rectangle fixing frame; the insulating sheets arranged at the other end are stuck with one end of the elastic sheet. The sample platform in a central position is fixed at the other ends of the eight elastic sheets to form flexible supporting structure. The invention combines and connects four electrodesof the outer walls (or inner walls) of the eight piezoceramics tubes into three pairs of electrodes according to a specific mode, the electrodes of the inner walls (or the outer walls) of the piezoceramics tubes are connected to the ground and three pairs of electrodes are respectively connected with three pairs of drive voltages so as to realize three-dimensional locating and scanning. The invention also has nanometer scanning range and nanometer resolution.