Disclosed are a method and device for transmitting data. The method includes: a network device sending configuration information to a terminal device, the configuration information including at least one of the following: information for indicating a starting position for transmission of an uplink data block, information for indicating an end position for transmission of an uplink data block, and information for configuring a reference signal for transmission of an uplink data block; and according to the configuration information, the network device receiving an uplink data block sent by the terminal device.