The invention relates to the field of crop cultivation, in particular to a purple cauliflower hybrid seed cultivation method. A mediummorchid parent 97.f3-7-3-1a3 is taken as a main body parent to be respectively hybridized with purple-flower vegetable material ZiYin-1 with Europe consanguinity, variant distant related ZiPa (purple cabbage) according to a seed cultivation object design technical scheme by use of existing germplasm resources; backcross or continuous backcross is performed on the F1 generation, individual selection and autocopuation in a net chamber are performed BC1, BC2 and descendants by virtue of a pedigreen method according to the seed cultivation object, so that two stable-character and good-regularity self-incompatible lines are line-bred after 6-7 generations; the hybrid F1 generation has great heterosis and has yield which is increased by not less than 80% than those of parents, and ball flowers are purple red in color, compact, gorgeous and glossy, taste crisp, tender and sweet if being not cooked, taste delicious, tasty and refreshing if being cooked, and are named as ZIJING-1.