The invention discloses a civil aviation satellite communication system which comprises a fixed pedestal and a circling pedestal. The system is characterized in that a rotation cavity is arranged in the middle of a top end surface of the fixed pedestal, the circling pedestal is arranged in the rotation cavity rotatably, the peripheral bottom of the circling pedestal is provided with a tooth-shapedring, an unlocking slip groove is arranged under the rotation cavity in the fixed pedestal, and the left and right ends of the rotation cavity are provided with left and right through cavities communicated with the unlocking slip groove symmetrically. The system is simple in the whole structure, reasonable in design, low in manufacturing cost, simple in operation and convenient to use, switchingbetween linear cleaning and circular cleaning can be controlled automatically, different positions on a substrate can be cleaned conveniently, the substrate cleaning efficiency is improved greatly, cleaning controlled manually can be replaced, the labor cost is reduced, the cleaning speed and precision are high, and the system is suitable for popularization and use.