A method for combining authentication and secret keys management mechanism in a sensor network includes the following steps: 1) pre-distribution of the secret key, which includes 1.1) the pre-distribution of the communication secret key and 1.2) the pre-distribution of the initial broadcast message authentication secret key; 2) authentication, which includes 2.1) the authentication of the node identity and 2.2) the authentication of the broadcast message; and 3) negotiation of the session secret key by the nodes.