A slight change in vacuum level can have serious impacts on fields such as aerospace,semiconductor manufacturing,and medical devices.Therefore,the study of a high precision,high sensitivity,and environmentally resistant vacuum pressure sensor based on the fiber optic tip is of great practical significance.However,the cost of fiber optic sensors remains a major obstacle to their further application.In response to the substantial demand for low cost,small sized,high reliability,and simple to manufacture vacuum pressure sensing probes in many fields,a Fabry Perot Interferometer (FPI) vacuum pressure sensing probe is presented in this paper.The FPI fiber optic vacuum pressure sensing probe based on a cascaded structure of single mode fiber (SMF),hollow core fiber (HCF),and no core fiber (NCF) is prepared using fixed length cutting and fiber grinding processes.Its characteristics,including low cost,simplicity of production,and high manufacturing efficiency lay the foundation for its application in multiple fields.The sensitivity of the vacuum micro negative pressure fiber optic sensor sample prepared in this paper reaches 5.07 pm/kPa.The low cost and simplified manufacturing solution proposed in this paper points the way towards the commercialization of fiber optic micro negative pressure sensors.