The article delves into the importance of fluorine modification in enhancing the photocatalytic performance of TiO2 for hydrogen production. Researchers have shown interest in TiO2 as a photocatalyst due to its efficiency and environmental friendliness. However, the rapid recombination of photogenerated carriers limits its effectiveness. Fluorine modification has emerged as a solution to this issue, with surface adsorption or lattice doping of fluorine being effective methods to boost the photocatalytic activity of TiO2. The minireview covers various aspects of fluorine-modified TiO2, including classification into surface-adsorbed and lattice-doped fluorination, as well as the impact of different Ti-F bonds on performance. Characterization techniques like X-ray photoelectron spectroscopy and solid-state nuclear magnetic resonance are highlighted. The article elaborates on the mechanistic influence of fluorine modification on the photocatalytic hydrogen production capabilities of TiO2. It discusses how fluorine modification can alter the surface chemical properties and electronic structure of TiO2, ultimately enhancing its functional performance. The research conducted sheds light on the potential of fluorine-modified TiO2 in sustainable energy applications, emphasizing its role in advancing green and sustainable chemistry.