Gel breaking method of clean fracturing fluid in hydrocarbon-free environment and application

The invention discloses a gel breaking method of a clean fracturing fluid in a hydrocarbon-free environment and application, and belongs to the technical field of preparation of fracturing fluids for oil fields. The clean fracturing fluid is prepared from the following raw materials in percentage by mass: 1-6% of a thickening agent, 0.2-0.8% of a composite breaking glue aid and the balance of water, wherein the thickening agent comprises an ampholytic surfactant, an organic solvent, alcohol amine, calcium carbonate, a scale inhibitor and the like; the composite breaking glue aid comprises sodium petroleum benzene sulfonate and a chelating agent. According to the method, divalent calcium ions are generated after the filtrate loss agent sodium carbonate powder in the fracturing fluid slowly reacts with the chelating agent, the problems that in the hydrocarbon-free environment, a surfactant type clean fracturing fluid is difficult to break gel and large in filter loss are solved, meanwhile, through the reaction