Pressurizing and gas collecting device for containment of nuclear power plant

The utility model discloses a nuclear power plant containment pressurizing and gas collecting device which comprises two gas inlet pipelines connected with gas outlets of two air compressors and a gas outlet pipeline connected with a containment, and a Y-shaped three-way gas gathering chamber is connected between the gas inlet pipelines and the gas outlet pipeline. An air outlet flange is arranged at one outlet end of the three-way gas gathering chamber, and air inlet flanges are arranged at two inlet ends of the three-way gas gathering chamber; a plurality of through holes are evenly distributed in the air inlet flange along the circumference and used for penetrating through connecting bolts to be correspondingly connected with the air inlet pipeline. A plurality of through holes are evenly distributed in the air outlet flange along the circumference, and connecting bolts penetrate through the through holes to be correspondingly connected with the air outlet pipeline. Sealing gaskets are arranged at all flan