Pseudo-boehmite, as a catalyst carrier, molecular sieve, and raw material for the production of activated alumina, is widely used in petrochemical, nitrogen fertilizer, environmental protection, and other industries. In recent years, China's petrochemical industry has faced severe challenges such as heavy and inferior crude oil, lighter, and high costs. The traditional synthesis of pseudo-boehmite includes the neutralization method and alcohol aluminum hydrolysis method, which the former has low cost and easy industrial practice, but the pore structure is poor. The latter can produce high-purity γ-AlOOH, but it has high cost and technical barriers, and there is an urgent need for low-cost production of pseudo-boehmite. Based on the controlled colloidal precipitation dissolution equilibrium of Al(OH)3 micelles, γ-AlOOH could be prepared by adding H2SO4 into NaAlO2 solution. This manuscript aimed at synthesizing γ-AlOOH with purified phase and specific pore structure by NaAlO2 and H2SO4 method combined with the pH swing technique. The γ-AlOOH was characterized by XRD, BET, SEM, NMR, etc., in which the specific surface area, pore volume, and average pore diameter were 341.01 m2/g, 0.41 cm3/g, and 4.78 nm, respectively, was synthesized by adding H2SO4 into NaAlO2 solution at 75℃, pH=7 and 30 min. It was also found that extreme synthesis temperature and terminal pH value lead to the formation of Al(OH)3 in γ-AlOOH, and the pH swing technology could effectively promote the transformation of the Al(OH)3 to γ-AlOOH, with the Al(OH)3 phase decreased from 28.2% to 3.1%. The crystallinity of pure γ-AlOOH increased during the swing process, and 27Al exists in the form of six ligands. Finally, the specific surface area, pore volume, and average pore diameter of γ-AlOOH were increased to 358.88 m2/g, 0.70 cm3/g, and 7.83 nm, respectively, with the temperature of reaction at 70℃, the addition rate of NaAlO2 and Al2(SO4)3 of 15 mL/min, reaction and aging time for 10 min.