Disclosed is a signal perception method and a device, comprising first measuring the energy of the received signal, wherein the adjacent symbol pair of the signal is complementary; then determining the authorization user when the channel is in the working state if the energy of the received signal exceeds the scheduled threshold value, else showing that no authorization user is present in the working state. Due to no corresponding silence period in the implementing process in the embodiment of the invention, the interruption of the communication operation can be avoided, meanwhile, no channelestimation is performed in advance, thereby effectively simplifying the processing procedure of the perception authorization user.