The invention discloses a method and device for contrasting a trust model based on data packet forwarding. The method comprises the following steps: directly observing a data packet receiving and forwarding condition of a network node b according to a network node a in a data packet forwarding network, determining a direct trust level on the network node b by the network node a; directly observing the data packet receiving and forwarding condition of the network node b through other neighbor network nodes of the network node a except the network node b so as to acquire a recommended trust level on the network node b by the network node a; acquiring a trust level model on the network node b by the network node a according to the direct trust level and the recommended trust level on the network node b by the network node a. Through the adoption of the above mentioned way, the technical support and theoretical basis can be provided for immediately and accurately judging and analyzing the trust state of the network node in a network, and the technical support and the theoretical basis can be provided for preventing hostile attack and soft security problem for an Ad hoc network.