The invention discloses a fixed-point fracturing method for tapping remaining oil of a longitudinal single sand body of an old well reservoir. The fixed-point fracturing method includes the followingsteps: step (1) the distribution position and orientation of the remaining oil of the longitudinal single sand body of the old well reservoir are determined; step (2) a stress profile model of the oldwell reservoir is established, and the position and the layer number of fixed-point fracturing of the single sand body are determined; step (3) the shape of a fracturing crack is simulated, fracturing crack parameters and the crack distribution orientation are determined, and the positions and number of nozzles of a directional hydraulic spraying fracturing drill tool are determined; step (4) a positioning support device is tripped into a well for setting, and then a gyro is tripped in for positioning and orienting; step (5) the directional hydraulic spraying fracturing drill tool is trippedin to be in abutting connection with the positioning support device; step (6) hydraulic sand spraying perforation and fracturing operation are conducted through the directional hydraulic spraying fracturing drill tool, fixed-point fracturing is conducted on the longitudinal first single sand body of the old well reservoir, and the remaining oil is tapped; and step (7) fracturing operation of the remaining single sand body is completed sequentially.