The invention relates to a method for forming automotive engine valve blanks accurately by secondary wedging cross wedge rolling, which comprises the following steps that: circular bars are arranged on a hole pattern between a top die and a lower die through an axial feeding device; a roller with a wedge-shaped die rotates in the same direction; rolled pieces enter the die to perform primary wedge rolling in the process of rotation; the die continues to rotate, and the rolled pieces enter the die to perform secondary wedge rolling; and after the rolled pieces are subjected to radial compression and axial extension and deformation continuously for two times, the formed rolled pieces are cut in the middle to obtain a pair of automotive engine valve blanks, and thus the die rotates a circle to produce a pair of automotive engine valve blanks, wherein the forming angle alpha of the wedge-shaped die is between 26 and 36 degrees, the widening angle beta is between 5 and 10 degrees, and the wedge sharp filleted corner R is between 3 and 10 millimeters. Compared with the conventional electric heat upsetting process, the method has the advantages of reducing the cost, improving the productivity and bringing obvious economic benefits.