The utility model relates to a pipeline ripple compensator, relating to an improvement of a structure of a ripple compensator for a gas delivery pipeline with high dust content and high moisture content. The structure comprises a ripple compensation pipe section and two outer flange pipes fixedly connected with two ends of the ripple compensation pipe section. The pipeline ripple compensator is characterized in that the structure also comprises a dustproof built-in protective pipe, wherein the end of the dustproof built-in protective pipe is horn-shaped, the dustproof built-in protective pipe is fixedly connected with inner walls of the two outer flange pipes and is arranged coaxial with the ripple compensation pipe section, and a gap is formed between the dustproof built-in protective pipe and the ripple compensation pipe section. The pipeline ripple compensator is suitable for the gas delivery pipeline with high dust content and high moisture content, and corrosion of equipment caused by dust and mud accumulation in the ripple compensator can be avoided effectively.