Embodiments of the present application disclose a multichannel access method, including: obtaining a transmission opportunity TXOP of a first reserved channel; sensing a non-reserved channel other than the first reserved channel in a preset time segment in the TXOP, and if the non-reserved channel is in an idle state, using the non-reserved channel as a second reserved channel; and when an ending moment of the preset time segment is reached, sending a current data frame on the first reserved channel and the second reserved channel. Correspondingly, the embodiments of the present application further disclose a multichannel access apparatus. Channel utilization can be improved by implementing the embodiments of the present application.