Embodiments disclose a channel resource allocation method and a communications device. The method includes acquiring, by a first device, scheduling information from an access point. The method also includes, if the first device is pre-scheduled by the access point according to the scheduling information to receive data from a second device in a first timeslot of a first channel, and before a start moment of data transmission time corresponding to the first timeslot of the first channel, sending, by the first device, a contention frame to contend for the first timeslot of the first channel.