The invention provides a guar gum fracturing flow-back fluid water treatment and reuse technology. The technology comprises the following steps: allowing a flow-back fluid to go through a solid-liquid separation device, allowing the obtained fluid to enter an oil-water separation device, allowing the obtained product to enter a recovery device, and uniformly reclaimed; allowing the obtained flow-back fluid to enter an oxidation pool from the recovery device, adding an oxidant, oxidizing, adding a flocculating agent to the oxidized fracturing flow-back fluid to carry out flocculation precipitation, precipitating, allowing the precipitated fracturing flow-back fluid to enter an air floatation device, allowing the back-flow fluid to be discharged from the air flotation device and to enter a chemical precipitation pool, adding an ammonium persulfate removal agent, adjusting the pH value, precipitating persulfate radicals and magnesium ions in the flow-back fluid through a chemical reaction, and separating the obtained precipitate through a filtering device. The fracturing flow-back fluid treatment technology has the advantages of simple process, water resource saving, cost saving, high COD removal rate, and reuse of a prepared fracturing fluid, and the prepared fracturing fluid has high temperature shearing resistance and has no influences on the fracturing construction effect.