The invention relates to the technical field of oil field extraction projects, and belongs to a hydraulic type full-bore large-displacement fracturing technique. By means of the hydraulic type full-bore large-displacement fracturing technique, the problem that an existing fracturing technique is small in bore and low in construction displacement. The technique comprises the steps that firstly, an expanding fracturing packer (5), a pressure guide sand blaster (4) and a plurality of full-bore pressure guide sand blasting packers (3) are connected with an oil pipe (2) and placed downwards into a casing pipe (1) to the preset depth; pressing is carried out, and hydraulic pressure passes through the pressure guide channel of the packers (3) and a pressure guide channel of the pressure guide sand blaster (4) so as to seal the packers; hydraulic pressure continues to be increased so that a first layer can be fractured; the hydraulic pressure is increased and enters pressure guide channel on a second layer, so that a variable-diameter ring (6) of the full-bore pressure guide sand blasting packer (3) on the second layer shrinks; a ball is tossed to the second layer, the hydraulic pressure is increased, and a sliding sleeve of the full-bore pressure guide sand blasting packer (3) of the second layer, and then the second layer can be fractured; and balls of the identical specification are used for construction from a third layer to an nth layer. The hydraulic type full-bore large-displacement fracturing technique has the advantages that the fracturing construction displacement is large, and safety and high efficiency are achieved.