Nitrogen protection reaction device

The utility model discloses a nitrogen protection reaction device which comprises a reaction container, a nitrogen protection device and a nitrogen protection device, an air inlet pipe opening of the protective balloon sleeves the first opening and is in sealed connection with the first opening; one end of the reflux condensing pipe is communicated with the second opening; the three-way valve is provided with three joints, namely a first joint, a second joint and a third joint, and the first joint is communicated with the other end of the reflux condensing pipe; the second joint is communicated with a nitrogen source; the third joint is communicated with a vacuum pump. Water vapor and air in the reaction container are pumped away and removed through the vacuum pump, nitrogen is provided for the reaction container through the nitrogen source, the reaction container is filled with nitrogen, operation is easy and convenient, cost is low, practicability is easy, the yield can be effectively improved, byproducts a