The invention discloses a reusable hydroxypropyl guar gum fracturing fluid, which at least comprises the following components, by weight: 0.35% of hydroxypropyl guar gum powder, 0.01-0.03% of a pH value conditioning agent, 1-3% of a discharge aiding agent, 0.5-2% of a clay stabilizing agent, 0.1-0.3% of a cross-linking agent, and 0.2-0.6% of a gum breaker, with the balance being water. The cross-linking agent is borax or organoboron, and the gum breaker is a compound of ammonium oxalate and paraformaldehyde or a compound of ammonium acetate and paraformaldehyde, wherein the mass ratio of ammonium oxalate to paraformaldehyde is 2:1 or the mass ratio of ammonium acetate to paraformaldehyde is 2:1. The gum breaker of sustained-release acids does not damage a macromolecular chain of guar gum macromolecule, and therefore, the discharged fracturing fluid can be reused after professional processing. Raw chemical materials are greatly saved; the cost of fracturing is reduced; and the environment is protected.