Provided are a method and a device for transmitting uplink data according to uplink cancellation indication information in a next-generation wireless network. A method of a terminal for transmitting uplink data may include: transmitting uplink data on the basis of uplink data resource allocation information; monitoring uplink cancellation indication information on the basis of monitoring configuration information on the uplink cancellation indication information; receiving the uplink cancellation indication information; and suspending the transmission of on-going uplink data on the basis of the uplink cancellation indication information.