The invention relates to an automobile engine cylinder body made of high silicon rare earth aluminum alloy, which overcomes the problems of complicated manufacture technology, high manufacture cost and poor lubrication effect in the course of working because a cylinder sleeve is embedded or a layer of abrasion-proof material is coated on the inner wall of the cylinder barrel of the cylinder body. The automobile engine cylinder body is characterized in that the cylinder body, the cylinder barrel and the inner wall of the cylinder barrel are an integrated structure integrally cast adopting the same high silicon rare earth aluminum alloy materials; and heat radiation wings are arranged on the periphery of the external side of the cylinder body. The cylinder body has the advantages of realizing a thin wall cylinder barrel without imbedding the cylinder sleeve and adding coating on the inner wall of the cylinder barrel, reducing total weight of the cylinder body, increasing heat radiation area, ensuring good heat radiation effect; an oil film is formed on the inner wall of the cylinder barrel in the course of working, thus abrasion resistance can be reduced, lubrication performance is improved, cylinder knocking is prevented, and production and imbedding procedures of the prior art are saved. Thus the invention has the advantages of simple manufacture technology, relatively lower manufacture cost and high reliability in the course of operation.