The invention relates to the technical field of heat-engine plant construction, in particular to a reinforcing device of a large size arc-shaped embedded part for fixation on the outer wall of a siloand a use method. Under the condition of no perforation, the large size arc-shaped embedded part is difficult to fix, the reinforcing device of the large size arc-shaped embedded part for the fixationon the outer wall of the silo comprises rebars and anchor bars which are used between a steel moulding plate and the embedded part, the steel moulding plate comprises an inner arc steel moulding plate and an outer arc steel moulding plate, the anchor bars comprise the connection anchor bars with mantling fiber and the support anchor bars with no mantling fiber, the anchor bars and the embedded part are fixedly connected, mantling fiber is conducted on the end parts of the rebars, the end parts of the rebars are used with the connection anchor barsthrough a front-reverse fiber sleeve in a matched mode, the front-reverse fiber sleeve is externally provided with a PVC pipe which is connected with the inner arc steel moulding plate through a rubber end cap, the gap between the embedded part and the steel moulding plate is not perforated, grout leakage of concrete is not generated, an accurate position and firm fixation of the embedded part are ensured, and good development prospects in the technical field of heat-engine plant construction are achieved.