The invention relates to a method for breaking self-incompatibility of an apple to obtain a filial generation. The method comprises the following steps of: taking apple trees with good growth vigor and strong development as female parent plants, classifying flower buds in different open states, wherein flowers with buds expanding but being covered by sepals are defined as first age class flowers,flowers with the buds protruding out of the sepals are defined as second age class flowers, flowers with the buds breaking through the sepals but being not unfolded are defined as third age class flowers, flowers with the buds opening are defined as fourth age class flowers; selecting the second age class flowers and the third age class flowers to perform self-pollination. The invention provides aclassification method of flower age classes before apple flowers blooming overcomes the reproductive isolation caused by self-incompatibility to a certain extent and successfully obtains the filial generation by performing self-pollination on styles of different flower age classes before blooming. The method can be used for simply and conveniently obtaining an inbred filial generation of the apple which is difficult to obtain by a conventional pollination method; and an effective mean is provided for obtaining genetic materials of allele homozygosity in the apple breeding process.