The invention discloses a method and a device for accelerating the data transmission speed of mobile equipment. The method comprises the following steps that a, when the mobile equipment detects that data based on MTP (media transfer protocol) is transmitted between the mobile equipment and an external storage body, a CPU (central processing unit) of the mobile equipment is regulated to be the maximum performance output; b, the duration t is set, and is the continuous duration of the maximum performance output; c, when the timing of the duration t is reached, whether the data transmission is finished or not is judged, if so, the maximum performance output stops, and if not, the operation returns to the step b. When the mobile equipment detects that data based on MTP is transmitted between the mobile equipment and the external storage body, the CPU of the mobile equipment is regulated to be the maximum performance output, the data transmission schedule is periodically detected in the maximum performance transmitting process, if the data transmission is finished, the maximum performance output stops, and otherwise, the maximum performance output continues; the CPU operation state is regulated through data transmission demands according to requirements, the data transmission speed is accelerated, and the user use experience is enhanced.