Abstract: The antimony doped SnO₂ thin film electrode was prepared by the sol-gel method.The film electrode was analyzed by means XRD,SEM,Cyclic Voltammetry.The effects of the calcination temperatures on the element composition,structure,phase and oxidizability were discussed.Taking phenol as target substrate for photoelectrocatalytic degradation experiments,the degradation rate of phenol and mineralization level under different calcinated electrodes were investigated.The results showed that the calcination temperature has large impact on micro-structure,surface composition,resistance and reactivity of the film,the structure of the SnO₂ thin films calcinated at different temperature are in the form of multi-crystal.Many cracks appear on the surface of the film electrode after different calcination which increase the reaction area and activated spots.The film electrode of antimony doped SnO₂ calcinated at 450℃ has lower resistance,strong oxidation,and favorite degradation effect.