The utility model relates to an antidetonation reinforced structure that is used for transformer substation's brickwork wall to open big entrance to a cave, this structure includes the collar tie beam that the level set up and the cross wall and the brickwork wall of a vertical setting and a lock ring roof beam, cross wall and brickwork wall compress tightly side by side to connect and set up, this structure still includes a plurality of relative concrete constructional columns that set up with the cross wall, concrete constructional column top supporting collar tie beam, cross wall, brickwork wall and concrete constructional column through the mutual drawknot of a plurality of drawknot units. Compared with the prior art, the utility model has the advantages of reduce engineering volume, reliable connection, applied wide.