The invention discloses a data transmission method and device, and belongs to the technical field of communication. The data transmission method and device are applied to first electronic equipment, and the first electronic equipment can run a first application and comprises a wireless communication module. The method comprises the following steps: when the first application is run, acquiring first control operation specific to the first application; controlling the wireless communication module serving as a wireless access node to establish a communication channel directly connected with at least one piece of second electronic equipment on a wireless link layer in response to the first control operation; and acquiring second control operation specific to the first application, and starting to transmit an alternative transmission file determined by the second control operation on the communication channel when the alternative transmission file exists. According to the data transmission method and device, transmission of the alternative transmission file is started on the communication channel when the second control operation is acquired, so that data transmission can be performed in advance without waiting for confirmation of a user, and the data transmission rate is increased.