Fracturing method adopting ultralow-density proppant and fracturing system applicable to fracturing method

The invention belongs to the technical field of oil production engineering and particularly relates to a fracturing method adopting an ultralow-density proppant and a fracturing system applicable to the fracturing method. The ultralow-density proppant is mainly adopted for fracturing, a highly concentrated ultralow-density sand blended liquid is designed, a centrifugal pump is adopted for pumping, and a magnetic flow meter is adopted for metering the concentration of the sand blending liquid precisely; a flowback liquid is treated and recycled after fracturing, and the problems of transportation, uniform mixing with a fracturing fluid and metering of the ultralow-density proppant are solved; the laying distance of the proppant in a crack is increased, a crack supporting area is increased, the non-continuous single-layer laying of the ultralow-density proppant in the crack is realized, the diversion capacity is improved, the production decline rate of an oil and gas well is retarded, the dosage of the proppant is reduced, and the targets of cost reduction and benefit increase are realized.