Abstract: This application provides a covert transmission method against active and passive cooperative attacks in a cognitive radio network. This method uses a joint design of noise uncertainty and power uncertainty to combat powerful collusion eavesdroppers. Then, the error detection probability of collusion eavesdroppers in the network and the covert transmission performance of legitimate users are analyzed. Finally, the numerical results show that the proposed scheme can guarantee the covert performance of the system, and can also resist the active and passive cooperative attacks of the collusive eavesdropper.