NOVELTY - A transparent oxide electrode of organic photovoltaic device processing method involves cleaning substrate of a transparent oxide electrode by using acetone, ethanol and de-ionized water to remove contaminants and impurities from surface of the transparent oxide electrode. The cleaned electrode is dried to transparent oxide electrode, followed by dissolving lithium perchlorate, sodium perchlorate, sodium permanganate, potassium perchlorate, rubidium perchlorate, cesium perchlorate or cesium permanganate in de-ionized water ultrasonically to obtain a cleaning solution.    USE - Method for processing a transparent oxide electrode of an organic photovoltaic device such as organic light emitting device, solar battery or organic thin film transistor (claimed).    ADVANTAGE - The method enables processing transparent oxide electrode of organic photovoltaic device with better stability in a simple and inexpensive manner.    DETAILED DESCRIPTION - A transparent oxide electrode of organic photovoltaic device processing method involves cleaning substrate of a transparent oxide electrode by using acetone, ethanol and de-ionized water for 3-5 times to remove contaminants and impurities from surface of the transparent oxide electrode. The cleaned electrode is dried to transparent oxide electrode, followed by dissolving lithium perchlorate, sodium perchlorate, sodium permanganate, potassium perchlorate, rubidium perchlorate, cesium perchlorate or cesium permanganate in de-ionized water ultrasonically to obtain a cleaning solution (50-500 mg/l). The electrode and substrate is placed in the cleaning solution under ultrasonic treatment for 5-20 minutes. The electrode is taken out. The solution on the surface of the electrode is washed by using deionized water. The electrode is dried by using UV treatment with UV power of 50-80 watts for 5-8 minutes or by using an oxygen plasma treatment with discharging power of 30-50 watts and oxygen flow rate of 20-50 ml/minute for 3-5 minutes to finish processing of the transparent oxide electrode.