The hydrolysis of soluble aluminum alloys has been identified as a safe and convenient method for online hydrogen production, with significant potential applications. Al-Ga-Mg-Sn bulk soluble aluminum alloy was selected for a one-step hydrometallurgical technique. Acid leaching agents, including organic acid buffers (e.g., oxalic, malic, and acetic) and inorganic acid solutions (e.g., nitric acid) were investigated. The type of leaching agent, pH value, temperature, and solution concentration are key factors influencing the recovery of the critical metal gallium (Ga) during hydrogen production. At a temperature of 70 °C and a leaching agent concentration of 0.2 mol?L_^-1, the organic acid buffer successfully recovered gallium, with oxalic acid exhibiting the highest recovery efficiency (86.88 %), followed by malic acid (73.40 %) and acetic acid (13.17 %). In contrast, the inorganic acid (nitric acid) solution failed to recover gallium. Oxalic acid, with an initial pH value of approximately 3.8, achieved a recovery of 94.38% observed at 70 °C and 0.3 mol?L_-1^{, and 93.78% at} 90 °C and 0.2 mol?L_-1^{. The leaching behavio}r of gallium was then tested and analyzed based on changes in pH value, surface tension of the recovered gallium, particle size, and Zeta potential of the product during the hydrolysis process. The results showed that the recovery of gallium from oxalic acid leachate increases with decreasing particle size of the product and with increasing absolute value of Zeta potential. The highest recovery (94.38 %) was achieved with a product particle size of 155 nm and a zeta potential value of -31.29 mV. The recovery of gallium from gallium-containing soluble aluminum alloys is a simple, environmentally friendly and highly efficient process.