Embodiments of the present invention provide an uplink transmission method and a related device, so as to at least resolve a prior-art problem that, in a solution in which UE preempts a channel by using LBT, when a UL grant is transmitted in a downlink, uplink transmission cannot be performed in a timely manner if the UE fails to preempt the channel, causing an uplink transmission delay and signaling waste. The method includes: obtaining, by UE, uplink transmission duration of uplink data that is to be sent by the UE; obtaining, by the UE, downlink transmission duration of downlink data transmitted by a base station on an unlicensed carrier; and if a sum of the uplink transmission duration and the downlink transmission duration is not greater than maximum channel occupation duration of occupying the unlicensed carrier each time, sending, by the UE, the uplink data on the unlicensed carrier after transmission of the downlink data ends. The present invention is applicable to the wireless communications field.
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