The invention discloses a method for removing ammonia nitrogen and nitrate nitrogen in high salinity wastewater. The method is characterized by comprising the following steps: filling high salinity wastewater into an alkali and acid resistant container (1), adjusting the pH value of the wastewater in the container (1), adding zinc sheets, which have been curved into rolls, into the container (1), adding a cadmium chloride solution, carrying out reactions in a space, which is insulted from the air, under stirring; after reactions, separating the solids and liquid, collecting the supernate for later use; transferring the supernate to a reactor (2), which is resistant to alkali, acid, high temperature, and high pressure, covering the reactor (2) by a cover, sealing the reactor (2), pumping oxygen gas into the reactor (2), carrying out wet type oxidation reactions under stirring, at a preset temperature and under a preset oxygen partial pressure, and filtering, wherein the filtrate is the processing effluent. According to the method, a composite metal catalytic reduction technology and a wet type oxidation technology are combined, the technological process is simple, the reaction conditions can be easily controlled, the total nitrogen removal rate is high, the water loss amount is little, the processing cost is low, and prominent economic benefits and environmental benefits are generated.