The invention discloses a method and a system for authenticating the identity of a power grid website based on trusted crypto modules. The method comprises the following steps: producing an identity certificate request and sending the identity certificate request to a digital authentication center unit by a website service-side through a PIK function which is provided by a first trusted crypto module; issuing a digital certificate to the website service-side by the digital authentication center unit; sending the self identity certificate to a client-side by the website service-side, and identifying the identity certificate of the website service-side by the client-side; identifying the identity certificate of the website service-side by a second trusted crypto module after the identity certificate which is sent by the website service-side is received by the client-side. The system comprises the digital authentication center unit, the website service-side, the first trusted crypto module, the client-side and the second trusted crypto module. The identity authentication of the website and the protection over user sensitive information are realized through the provision of a reliable user certificate issuing and identity authenticating method under the condition of realizing the bidirectional identity authentication of the power grid website and the client-side user.