An automatic electronic certification trading system, comprising: a trading device, a wireless mobile device, an electronic certification import device, an electronic certification server; wherein, the electronic certification server stores a multigroup electronic certification collection, and the electronic certification collection is imported to the trading device through the electronic certification import device or to the trading device by the electronic certification server through wireless network. Next, it is detected if the distance between the wireless mobile device and the trading device entering a set distance or not. If the wireless mobile device enters the set distance, the trading device chooses one or a plurality of electronic certifications from the electronic certification collection and delivers one or a plurality of electronic certifications to the wireless mobile device, so that the user of the wireless mobile device can deliver one or a plurality of electronic certifications of the wireless mobile device to the trading device or other same type of trading devices for identity recognition or/and trading certification.