In view of the current over 10 Gb/s high-speed SerDes interface of 8B/10B encoding requirement, this paper is based on the traditional multi-channel encoder and improves its structure. The polarity quick generation module is added and it reduces the waiting time of internal channel encoder. The efficiency of parallel encoding and data transmission rate are improved. Meanwhile, the output coding latency declines. The simulation results of the circuit show that the data transmission rate of the encoder reaches 20.6 Gb/s and 38.4 Gb/s respectively in the four-channel and eight-channel modes, and the coding output latency is one clock cycle, which fills the gap of the domestic low-delay high-speed 8B/10B encoder.