Data transmission method and device

The invention discloses a data transmission method and device. The method comprises the steps that a to-be-sent issued document is obtained; the issued document is split into multiple sub-documents, wherein the data volume of each sub-document conforms to the transmission data volume of a preset issued protocol; multiple sub-documents are sent to a terminal in sequence, wherein multiple sub-documents received by the terminal are spliced into the issued document. According to the data transmission method and device, the technical problem that due to the fact that the data volume of the issued document is larger than the transmission data volume of the issued protocol, the issued document cannot be issued normally is solved. 本发明公开了种数据传输方法及装置。其中，该方法包括：获取待发送的下发文件；将下发文件拆分成多个子文件，其中，每个子文件的数据量符合预设下发协议的传输数据量；依次向终端发送多个子文件，其中，终端将接收到的多个子文件拼接成下发文件。本发明解决了由于下发文件的数据量大于下发协议的传输数据量导致的下发文件无法正常下发的技术问题。