A crack intervention-based enhanced imaging method that can improve the observation accuracy of a rock hydraulic fracturing experiment is provided, and adopts an aqueous solution containing a nanoscale high-atomic-number intervention enhancer for hydraulic fracturing of a rock in the formation of a hydraulic fracturing crack (6). The intervention enhancer in the hydraulic fracturing crack (6) increases the difference between the X-ray mass attenuation coefficients, μ/ρ, of the hydraulic fracturing crack (6) and the rock and increases the difference between the X-ray mass energy-absorption coefficients, μen/ρ, of the hydraulic fracturing crack (6) and the rock, thereby changing a linear attenuation coefficient received by a detector (15) and improving imaging resolution of the hydraulic fracturing crack (6) in the rock. The method can overcome shortcomings and deficiencies of poor distribution positioning accuracy of the hydraulic fracturing rock cracks (6) and difficulty in identifying cracks having common widths, and can improve observation accuracy with respect to hydraulic fracturing rock cracks (6), facilitating scientific understanding of the development pattern of the hydraulic fracturing rock cracks (6).