The shape of KS-electric elbow is streamlined, with built-in cable, beautiful simulation, available in flesh color, black color and white color, the signal input and output interface are compatible with the international common interface, and the wrist can be equipped with KS-quick disconnector wrist interface, which is compatible with the international common quick disconnector wrist interface. The KS-electric elbow can be in combination with the KS-bionic hand to form a series bionic arm products with 6 to 9 degrees of freedom, and can also be compatible with other company myoelectric hands or bionic hands with quick disconnector wrist interface.