The embodiment of the invention provides a key generation method of a collaborative signature. A second communication party forwards a signature request to auxiliary equipment, and the auxiliary equipment generates a first private key component and a second private key component after receiving the signature request. Then, the auxiliary equipment stores the second private key component and sends the first private key component to the second communication party, and the second communication party sends the first private key component to the first communication party. It can be understood that the auxiliary equipment can utilize the second private key component, and the first communication party can perform collaborative signature on the data by utilizing the first private key component. Theprobability that the second private key component stored in the auxiliary equipment is acquired by other equipment is smaller than or equal to the preset threshold value, the second private key component stored in the auxiliary equipment can be basically considered not to be leaked, so that the second private key component cannot be leaked by utilizing the scheme of the embodiment of the invention, the security of the user private key is ensured, and the security of finishing the corresponding service by the user by utilizing the Internet is ensured.