The invention discloses a wireless data transmission system and method of discrete electric vehicle charging piles. The system comprises: a master station charging pile and a plurality of slave station charging piles, whose installation positions are located on the same straight line, the plurality of slave station charging piles are arranged on both sides of the master station charging pile, there is no shielding object between arbitrary two adjacent charging piles, the master station charging pile accesses a mobile communication network and provides a wireless AP signal for the plurality of slave station charging piles, all slave station charging piles are arranged within an effective transmission radius of the wireless AP signal, and each slave station charging pile serves as a Station to access the wireless AP signal.