A data transmission method and user equipment is provides. The method includes: sending, by user equipment (UE), auxiliary scheduling information to a first part of or all of network side devices, an uplink transmission state of the UE is determined according to the auxiliary scheduling information, and perform scheduling on the UE according to the uplink transmission state of the UE, where the uplink transmission state is a first uplink transmission state in which uplink data can be simultaneously transmitted on an uplink carrier corresponding to all of the network side devices, or is a second uplink transmission state in which uplink data can be simultaneously transmitted on an uplink carrier corresponding to a second part of the network side devices; and transmitting, by the UE, data according to scheduling information of the second part of or all of the network side devices.