In view of the limitations of current blood pressure sensors, such as electromagnetic interference, large size and difficult integration, a micro optical fiber sensor for blood pressure detection in interventional catheterization is proposed. By adopting the principle of lateral forces on a suspended optical fiber, the sensor can be flexibly integrated into a medical catheter to achieve the fixed-point intravascular pressure measurement. A 4 mm external diameter micro optical fiber blood pressure sensor is fabricated and packaged by light-curing 3D printing technique. The static and dynamic characteristics of optical fiber sensor and the application test of simulated vascular pressure are carried out. The experimental results show that the sensitivity and linearity of the micro optical fiber blood pressure sensor are 0.723 pm/ kPa and 0.996 respectively in the range of -50~50 kPa, and the dynamic test results are in good agreement with the commercial sensors, and the feasibility of the operation is verified on the blood vessel heart model.