The invention discloses a sectional grouting method for a tube. The sectional grouting method for the tube comprises the following steps: selecting a steel tube with a plurality of slurry outlet holes; pressing the steel tube into a soil body; then placing a grouting head in the steel tube, wherein the grouting head consists of a grouting tube with holes in the side wall and two rubber sealing plates which sleeve the grouting tube in a spaced manner, a grouting cavity is defined by the two rubber sealing plates and the inner wall of the steel tube, and the rubber sealing plates are in clearance fit with the inner wall of the steel tube without the effect of a pressing force; extruding the two rubber sealing plates to be expanded by a tightness adjusting mechanism on the grouting head so that the rubber sealing plates are in interference fit with the inner wall of the steel tube; and grouting to the inside of the grouting cavity through the grouting tube, and injecting the slurry into the soil body through the slurry outlet holes in the steel tube to form a grouting expanded head. The sectional grouting method for the tube has the advantages that the sectional grouting method is simple and convenient to operate, and by the extrusion and expansion characteristic and the springback characteristic of the rubber sealing plates, movement or locking sealing of the grouting cavity in the steel tube can be controlled freely.