Gas-liquid separating unit

The invention relates to a gas-liquid separating unit, comprising a separation tube and a transversal arranged S-shaped pipeline, wherein, the separation tube is arranged vertically to the ground, the separation tube comprises a gas-liquid dividing point, an air channel from the gas-liquid dividing point upward, and a liquid channel from the gas-liquid dividing point downward, and liquid-containing gas is introduced from the gas-liquid dividing point; one end of the S-shaped channel is connected with the liquid channel, and liquid is gathered between the end of the S-shaped channel and the top of the S-shaped channel to form a liquid seal part, and the liquid overflowed from the liquid seal part is introduced through the other end of the S-shaped channel. The gas-liquid separating unit can be used for assisting conventional gas-liquid separation devices to improve the gas-liquid separation effect.