The invention provides a large capacity solid phase condensation polymerization process and belongs to the technical field of preparation or chemical processing of terephthalate high molecular compounds. The process comprises the following steps: feeding a raw material section to a crystallizer, stirring the raw material section under circular N2 at 180-185 DEG C, and leaving the raw material section in the crystallizer for 5-30 min, wherein the outlet temperature of the crystallizer is 175-182 DEG C; and feeding the crystallized section into a reactor which comprises a ridge reaction sectionand at least two filling reaction sections, and outputting the section after the reaction to obtain a product hyperviscous section.