The invention discloses a data transmission method and system, a computer storage medium and a terminal. The method comprises the steps that a self-service equipment front system sends to-be-transmitted data to a third-party system by the adoption of an HTML page; the third-party system processes the data and returns a corresponding processing result; and the self-service equipment front system receives and outputs the data processing result by the adoption of the HTML page. Through the scheme, resources can be saved when the self-service equipment front system performs data transmission withthe third-party system.