The invention discloses a multi-branch pipe gas-liquid separator. The separator comprises a separator cylinder body and a liquid-accumulating cylinder, wherein a gas-liquid inlet is formed at the position close to the right side of the liquid-accumulating cylinder and is connected with a gas-liquid inlet header pipe; the gas-liquid inlet header pipe is divided into an ascending pipe section tail and a descending pipe section; gas inlet branch pipes are arranged at the tail end of the ascending pipe section and the head of the descending pipe section of the gas-liquid inlet header pipe respectively; the gas inlet branch pipes are arranged above the separator cylinder body and are connected first to positions parallel to separator cylinder body and then to a gas phase inlet header pipe; and the tail end of the descending pipe section of the gas-liquid inlet header pipe is connected with a liquid phase inlet arranged at the upper left of the separator cylinder body. The separator has the advantages of effectively capturing the slug flow formed in a pipe conveying and cleaning process and achieving the effect of quick, safe and effective separation.