The invention relates to a selective breeding method for a hybridized-Argopecten irradians backcross low-temperature-resistant scallop line. The method is characterized by comprising the steps: firstly, selecting individuals, which are high in growth speed and high in low-temperature resistance, from a family or population of a first filial generation of Argopecten irradians and Argopecten purpuratus as parent scallops; carrying out back crossing on individuals, with high low-temperature resistance, of the first filial generation and Argopecten irradians ova so as to establish a backcross family or population; and then, carrying out selective breeding on low-temperature resistant breeding core groups for at least three times. According to the method, the first filial generation which is high in growth speed and remarkable in heterosis is adopted as a male parent and then is subjected to back crossing with the Argopecten irradians (a female parent) so as to polymerize a chilling-resistant gene of the Argopecten irradians to a first generation of hybridized-Argopecten irradians backcross, the individuals, with high low-temperature resistance, of the first generation of hybridized-Argopecten irradians backcross are taken as a breeding core group and is subjected to continuous 3 generations of low-temperature resistant breeding, the low-temperature resistance is extended to 0 DEG C, the growth speed is increased by 15% compared with that of the Argopecten irradians, and then, a low-temperature resistant new line which is applicable to wintering of Shandong sea area is obtained. Apparently, the method is simple and convenient in operation and is extensively applied to the selective breeding of hybridized low-temperature resistant scallop lines.