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In this study, a self\u2010supported electrocatalyst of flower\u2010like cobalt phosphide and tungsten oxide (Co<jats:sub>2<\/jats:sub>P\/WO<jats:sub>3\u2212x<\/jats:sub>\/CC) was prepared on carbon cloth (CC) surface by hydrothermal reaction with solution immersion etching and phosphorization annealing under H<jats:sub>2<\/jats:sub>\/Ar atmosphere. This strategy can generate oxygen vacancies (O<jats:sub>V<\/jats:sub>), improving the speed of charge transfer between cobalt phosphide (Co<jats:sub>2<\/jats:sub>P) and tungsten oxide (WO<jats:sub>3\u2212x<\/jats:sub>) components. The catalyst greatly increases the electrochemical active surface area, which is beneficial for efficient oxygen evolution. Electrochemical testing studies show that in 1.0\u2005M KOH solution, Co<jats:sub>2<\/jats:sub>P\u2013WO<jats:sub>3\u2212x<\/jats:sub>\/CC catalyst exhibits good OER activity, with a low overpotential of 254\u2005mV at 10\u2005mA\u2009cm<jats:sup>\u22122<\/jats:sup>, a small Tafel slope of 58.32\u2005mV\u2009dec<jats:sup>\u22121<\/jats:sup>. The synergistic effect of oxygen vacancies and Co<jats:sub>2<\/jats:sub>P with WO<jats:sub>3\u2212x<\/jats:sub> can regulate electronic structures, expose more active sites, and cooperatively enhancing the OER activity. 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