The invention provides a method and device for transmitting data between different terminals. The method mainly comprises the steps of enabling a first terminal to package data needing transmitting into an XML (extensible markup language) format, and generating XML files, and enabling the first terminal to assemble hyper text transport protocol (HTTP) data packets according to the XML files; and enabling the first terminal to send the HTTP data packets to a second terminal through a wireless communication network. Data transmission can be effectively performed between the terminals of different data interfaces, and the terminal interfaces do not need to be modified specifically.