A process of an integrated ridge-filling reactor for polyester solid-phase tackification belongs to the technical field of chemical fiber production. An integrated ridge-filling reactor is adopted, wherein the upper part is a ridge preheating section; the middle part is a filling reaction section; the lower part is a cooling section; a heat medium heating coil pipe is disposed at the external wall of a cylinder body of the middle filling reaction section. Hot nitrogen is introduced from a high-temperature nitrogen inlet at the lowest section of the ridge; low-temperature nitrogen is introduced from a low-temperature nitrogen inlet at the bottom of the reactor; and a slice is cooled directly; the nitrogen flows upwards in an inverse direction to the slice, and is mixed with hot nitrogen introduced from the ridge section; the high-temperature high-viscosity slice from the filling section is cooled to below 100 DEG C. The process of the invention has high yield, short flow, high process efficiency, and economical cost; the material is heated uniformly, and is not easy to cake; no individual slice cooling device is necessary; nitrogen in the reactor is uniformly distributed; the process temperature range is 200-230 DEG C; and the process production adjustment range is 50%-110% of the design yield of the device.