The present invention is an active up-link power control for the to control the power level of the uplink signal to calculate the attenuation of the uplink signal according thereto, and is currently measuring the rainfall on the basis of the received beacon signal levels in real-time satellite communication system earth station apparatus and It relates to the method. In the present according to the invention an active uplink power control of the earth station for a satellite communication system, apparatus and method is a UL power control method of an earth station for a satellite communication system to perform uplink power control by using a beacon signal which is applied from a satellite calculating the attenuation of the downlink signal based on the beacon signal, and the based on the downlink attenuation and calculating the current rainfall, is configured to control the power of the UL signal to calculate an uplink attenuation according to the rainfall information. Thus, by being able to accurately perform uplink power control in accordance with the precipitation, it is possible to minimize the speech quality degradation of the satellite communication system.