The utility model discloses a shaft well thin wall grouting deformation observation device comprising a measuring tube. One end of the measuring tube is provided with a support which is fixedly provided with a dial indicator. The end of the measuring tube is fixedly connected with a first expansion bolt of the wall of one side of the shaft well, and the other end of the measuring tube is connected with a second expansion bolt of the wall of the other side of the shaft well in an overlapped manner. The expansion bolts are disposed on the walls of the shaft well to be cooperated with the measuring tube and the dial indicator, and therefore the deformation condition of the shaft well thin wall during the grouting operation can be known accurately, and the successful operation of the consolidation grouting can be guaranteed, and the project quality can be guaranteed. The shaft well thin wall grouting deformation observation device has advantages of simple structure, easy operation, convenience, and practicability.