In order to obtain the real-time video information of fish in light fishing, a video system loaded in underwater LED fish gathering lamp was designed. In terms of structure design, the underwater LED fish gathering lamp was taken as a carrier, and a set of digital video solution was embedded in it. As to the digital design, orthogonal frequency division multiplexing (OFDM) was used to overcome the interference of the clutter and the fixed pulse of current signal in the power line to the video signal. In communication design, power line communication (PLC) was used as a video signal transmission scheme. The system was tested after design, and the test results showed that, on the condition that the power line’s nominal cross-sectional area is 6 mm2, and its length is 30 m, the system delay is 3 ms, the packet loss rate of the system is 0%, and the actual transmission rate is 8,000 Kbps. This system, on the condition that it doesn’t change the lamp’s structure and adds no additional single line, adds the video function to the underwater LED fish gathering lamp, and can be either used as an auxiliary fishing equipment in light fisheries or  applied in fish behavior experiment.