The invention relates to a forced drainage gas-liquid separator. The forced drainage gas-liquid separator is characterized in that the forced drainage gas-liquid separator consists of a tank body, anexhaust tube, a gas-liquid inlet tube communicated with a filter, a gas-liquid separation device A and a filter liquor drainage device; the gas-liquid separation device A is arranged at the middle part inside the tank body, the gas-liquid separation device A consists of two to three baffle plate groups arranged in parallel and a baffle plate group substrate, the baffle p late group substrate is fixedly arranged on the base plate of the tank body, the tops of the baffle plate groups are fixedly connected with the top plate of the tank body through fixed plates, and the lower ends of the baffleplate groups are fixedly connected with the baffle plate group substrate; the filter liquor drainage device is arranged at the lower part of the right side outside the tank body and consists of a filter liquor drainage pipe and a filter liquor pump, and the filter liquor pump uses a KROUGH pump. The forced drainage gas-liquid separator has the advantages that firstly, the retaining time of a gas-liquid mixture on the baffle plate groups is increased, the separation effect is better, and the exhaust water content is lower than 0.5%; and secondly, the KROUGH pump is excellent in performance, thefilter liquor is forced to be drained, and the capital investment and production cost are reduced.