An identity authentication method of an internet account, an identity authentication device of an internet account and a system are provided. The method may includes: receiving an identity authentication request sent by a client device, where the identity authentication request includes account information; acquiring identity authentication information corresponding to the account information, where the identity authentication information is pre-generated based on the account information and includes at least one authentication question and at least two answer options corresponding to the authentication question; sending the identity authentication information to the client device; and receiving, from the client device, answer information obtained by choosing an answer from the at least two answer options corresponding to the authentication question, determining whether the answer information meets a preset condition and providing an identity authentication response to the client device according to a determined result.
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