The utility model relates to the technical field of a suspension expansion device used for fixing a well drilling in oil drilling, and discloses an expansion type suspension device of screen pipe well completion. The expansion type suspension device of the screen pipe well completion comprises an expansion pipe, an expansion device, an adapter substitute and a salvageable seat sealing device. The expansion device is arranged in the expansion pipe. The expansion pipe comprises a diameter expansion pipe, a connecting pipe neck and a pipe body form top to down, wherein inner diameters and outer diameters of the diameter expansion pipe, the connecting pipe neck and the pipe body are increased in sequence. The salvageable seat sealing device is arranged in the pipe body which is arranged on the lower portion of the expansion device. A vulcanizing rubber ring is fixed on the outer wall of the upper portion of the diameter expansion pipe or at least two vulcanizing rubber rings are fixed on the outer wall of the upper portion of the diameter expansion pipe from top to bottom. The expansion type suspension device of the screen pipe well completion is reasonable and contact in structure, finishes the screen pipe well completion safely, conveniently and quickly in superficial layer thickened oil horizontal well screen pipe well completion, achieves the goal of permanent suspension and good sealing on the condition that loss of a shaft drift diameter is minimum, and is reliable in performance. The application of the salvageable seat sealing device reduces the drilling and grinding bottom lock process in a conventional expansion pipe operation process, and production efficiency is improved.