A data transmission device, wherein the device comprises: a processing unit, configured to: when a triggering instruction for triggering a periodic buffer status report, BSR, is received, obtain a priority of a logical channel to which uplink data that is being sent belongs, and obtain a priority of a logical channel to which the periodic BSR belongs, wherein the processing unit is further configured to determine whether a priority of the uplink data is higher than a priority of the periodic BSR based on the priority of the logical channel to which the uplink data belongs and the priority of the logical channel to which the periodic BSR belongs; and a transmit unit, configured to send the uplink data to a base station at a priority higher than the priority of the periodic BSR when the priority of the uplink data is higher than the priority of the periodic BSR, wherein the transmit unit is further configured to send the periodic BSR to the base station at a priority higher than the priority of the uplink data when the priority of the uplink data is lower than the priority of the periodic BSR, wherein the device further comprises: a receiving unit, configured to receive configuration information sent by the base station, wherein the configuration information comprises a preset priority sequence and a priority identifier, the preset priority sequence is used to indicate a priority sequence among multiple logical channels of user equipment UE and a priority sequence between uplink data and a periodic BSR on each logical channel; wherein the processing unit is further configured to determine, based on the priority identifier, whether to use the preset priority sequence; and that a processing unit is configured to obtain a priority of a logical channel to which uplink data that is being sent belongs, and obtain a priority of a logical channel to which the periodic BSR belongs comprises: the processing unit is configured to: when determining to use the preset priority sequence, obtain the priority of the logical channel to which the uplink data that is being sent belongs, and obtain the priority of the logical channel to which the periodic BSR belongs. a processing unit, configured to: when a triggering instruction for triggering a periodic buffer status report, BSR, is received, obtain a priority of a logical channel to which uplink data that is being sent belongs, and obtain a priority of a logical channel to which the periodic BSR belongs, wherein the processing unit is further configured to determine whether a priority of the uplink data is higher than a priority of the periodic BSR based on the priority of the logical channel to which the uplink data belongs and the priority of the logical channel to which the periodic BSR belongs; and a transmit unit, configured to send the uplink data to a base station at a priority higher than the priority of the periodic BSR when the priority of the uplink data is higher than the priority of the periodic BSR, wherein the transmit unit is further configured to send the periodic BSR to the base station at a priority higher than the priority of the uplink data when the priority of the uplink data is lower than the priority of the periodic BSR, wherein the device further comprises: a receiving unit, configured to receive configuration information sent by the base station, wherein the configuration information comprises a preset priority sequence and a priority identifier, the preset priority sequence is used to indicate a priority sequence among multiple logical channels of user equipment UE and a priority sequence between uplink data and a periodic BSR on each logical channel; wherein the processing unit is further configured to determine, based on the priority identifier, whether to use the preset priority sequence; and that a processing unit is configured to obtain a priority of a logical channel to which uplink data that is being sent belongs, and obtain a priority of a logical channel to which the periodic BSR belongs comprises: the processing unit is configured to: when determining to use the preset priority sequence, obtain the priority of the logical channel to which the uplink data that is being sent belongs, and obtain the priority of the logical channel to which the periodic BSR belongs. a receiving unit, configured to receive configuration information sent by the base station, wherein the configuration information comprises a preset priority sequence and a priority identifier, the preset priority sequence is used to indicate a priority sequence among multiple logical channels of user equipment UE and a priority sequence between uplink data and a periodic BSR on each logical channel; wherein the processing unit is further configured to determine, based on the priority identifier, whether to use the preset priority sequence; and that a processing unit is configured to obtain a priority of a logical channel to which uplink data that is being sent belongs, and obtain a priority of a logical channel to which the periodic BSR belongs comprises: the processing unit is configured to: when determining to use the preset priority sequence, obtain the priority of the logical channel to which the uplink data that is being sent belongs, and obtain the priority of the logical channel to which the periodic BSR belongs.