The invention provides a processing method of a power amplification module of an earth station in the field of satellite communication. The method comprises the following steps of: the step 1, sintering a first microwave circuit board and a second microwave circuit board on a cavity; the step 2, mounting a power amplifier chip on the cavity and performing sintering; the step 3, mounting a resistance-capacitance chip on the first microwave circuit board and performing sintering; the step 4, cleaning the power amplification module cavity of the sintered component by using a vapor phase cleaningmachine; and the step 5, assembling a radio frequency connector, an isolator and a filter on the cavity and sealing the cavity. The design is reasonable, the power amplification module of the earth station in the field of satellite communication manufactured by the method completely meets the technical index requirements through environmental tests, has the characteristics of the high output power, flexible processing, the high reliability, the high stability and the high gain, is simple, convenient and scientific in process flow, improves the qualification rate of products and the productionefficiency of workshops, and is suitable for mass production.