Double-layer refractory brick for rotary kiln

The double-layer refractory brick for the rotary kiln belongs to the field of refractory brick bodies and comprises a first refractory brick body and a second refractory brick body, limiting grooves are formed in the two sides of the bottom of the first refractory brick body, and inserting blocks are symmetrically arranged on the surfaces, on the two sides of the limiting grooves, of the first refractory brick body. Limiting blocks are integrally formed on the two sides of the surface of the second refractory brick main body, a first protective layer and a second protective layer are sequentially laid on the surface of the second refractory brick main body, the first refractory brick main body and the second refractory brick main body are spliced and formed, and the limiting grooves correspondingly make contact with the limiting blocks. The fireproof brick composition structure is optimized, a layered splicing structure is arranged to be combined into a whole, the mineral wool board and the pearl panel are ar