The present invention relates to the field of mobile communication and provides a method, a device and a system for controlling data transmission power of an opposite end, so as to reduce power waste during the transmission of special burst data. The method comprises: Step 1: receiving data from an opposite end; Step 2: judging whether the received data is special burst data or service data; Step 3: if the received data is the service data, controlling service data transmission power of the opposite end in accordance with a value of a service data power control parameter; and Step 4: if the received data is the special burst data, controlling special burst data transmission power of the opposite end in accordance with a value of a special burst power control parameter, wherein the value of the special burst data power control parameter is different from the value of the service data control parameter, and the special burst data transmission power of the opposite end is less than the service data transmission power of the opposite end. According to the present invention, it is able to reduce power consumption during the transmission of special burst data.