In response to the communication needs of marine resource exploration, underwater environmental monitoring and other fields in recent years, this paper proposes a new type of underwater image acquisition and transmission scheme, and designs a set of high-speed visible light video transmission system based on blue light-emitting diode(LED) according to this scheme. It has been tested and verified that the system can collect and transmit 720P high-definition video images underwater with a transmission distance of 1.4 m.