The invention discloses an underground nitrogen-making induced flow completion pipe string having a pressure monitoring function. The underground nitrogen-making induced flow completion pipe string is mainly composed of an oil pipe hanging part, an oil pipe, an underground safety valve, an underground pressure meter, a production packer, a working cylinder, an inserting positioning seal, a blind pipe and an underground nitrogen-making induced flow device. The upper end of the oil pipe is hung in an oil well through the oil pipe hanging part. The underground safety valve, the underground pressure meter, the production packer and the working cylinder are arranged on the oil pipe. The lower end of the oil pipe is connected with the blind pipe through the inserting positioning seal which is inserted into a sealing cylinder of a sand control packer in the oil well. The underground nitrogen-making induced flow device is inserted into the blind pipe. Due to adoption of the above structure, after a first safety shield of a gas well is built, a Christmas tree is assembled, and setting and seal examination are carried out on the production packer until the production packer is qualified, a large amount of nitrogen can be rapidly generated through dropbar excitation and the gas well is induced. Besides, in the long-term production process, the underground pressure is monitored in real time. The underground nitrogen-making induced flow completion pipe string has a good application and popularization prospect.