Platform secondary authentication login system and method

The invention discloses a platform secondary authentication login system and method. The system comprises a target platform and an OTP management server, the target platform carries out primary authentication on an account name and a password input by a target object, the account name is sent to the OTP management server when the authentication is passed, and the OTP management server inquires whether the account name is registered or not; if so, sending prompt information of inputting the OTP code to the target platform; if the account name is not registered, registration prompt information is sent to the target platform, and prompt information for inputting the OTP code is sent to the target platform after the account name is registered; and the target platform sends the OTP code input by the target object to the OTP management server for secondary authentication, and executes an access operation corresponding to the access request when the secondary authentication is passed. According to the method and the