The present disclosure provides a channel monitoring method and a channel monitoring device, to achieve the channel resource contention for an LTE system in the case that it operates on an unlicensed carrier. The channel monitoring method includes steps of: determining, by a device, a starting time point of CCA detection for monitoring a channel before data transmission and a required duration within which a CCA detection result indicates that the channel is clear; and monitoring, by the device, the channel on an unlicensed frequency band in accordance with the starting time point and the required duration.