The invention relates to crop variety breeding and preparation of market seeds, and particularly discloses a preparation method of a novel conventional cultivar for crops. According to the preparation method of the conventional cultivar for crops, provided by the invention, through breeding and production of mixed homogeneity seeds (produced seeds comprise selfed seeds of material A1 and hybrid of materials A1/A2 ), the condition that illegal seed enterprises steal seeds for self propagation is effectively avoided, infringement action of conventional selfed crop new species is reduced to a certain extent, and the intellectual property protection force to the conventional selfed new species of the seed enterprises is reinforced.