The invention relates to a light-emitting diode (LED) large screen display control system and an LED large screen display control method. The method comprises the following steps of: in data source equipment, labeling data flow and transmitting the labeled data flow to remote display equipment; and in the remote display equipment, receiving the data flow with the label, converting the data flow with the label into metadata with the label, broadcasting to M LED display units, acquiring sub-picture data corresponding to the position of the received metadata from the received metadata by the M LED display units on the basis of the position information of the metadata and the label information in the metadata, and displaying, wherein the sub-picture data is a part of the metadata. By using the system and the method, data buffer memory is not required, so that delay is not generated, and real-time high speed transmission and stable synchronous display can be realized. In addition, fault positions can be intelligently fed back, so that the maintenance cost can be reduced.